# DISPLACEMENT & VELOCITY

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1 PHYSICS HOMEWORK #1 DISPLACEMENT & VELOCITY KINEMATICS d v average t v ins d t verysmall / error d t d t v a ave t 1. You walk exactly 50 steps North, turn around, and then walk exactly 400 steps South. How far are you from your starting point?. An automobile travels 5 miles West, then goes 45 miles East and finally goes 15 miles West. How far will this car be from its starting point? 3. A car goes North a distance of 10 miles during a time period of 3.0 hours. What is the average speed of the car during this time interval? 4. The distance between Denver Colorado and Vail Colorado is 13 miles. With what average speed should you drive your car in order to travel this distance in exactly ½ hours? 5. A small cart is rolling along a horizontal surface and you measure that the cart moves a distance of 3.5 meters over a time period of 1.35 seconds. What is the average speed of the cart? 6. A block of wood, which is 1.0 cm long, is dropped through an infrared sensor designed to measure the time that the sensor is blocked. Assuming that this block of wood blocks the sensor for a time interval of 0.7 seconds, what is the speed of this block as it passes through the sensor? Is this speed average or instantaneous? 7. Suppose that in problem #6 above the length of the block is known to an accuracy of +/- 0.3 cm, while the timer is limited to an accuracy of +/ seconds. a. What is the maximum speed you would calculate for this block, based on these error limits? b. How much does this maximum differ from the speed calculated in #6 above? c. What is the minimum speed you would calculate for this block based on these error limits? d. How much does this minimum speed differ from the calculated speed in #6 above? e. How do the maximum (b) error and the minimum (d) errors compare?. An infrared sensor system is set up so that two sensors start timing when the infrared beam of the first sensor is blocked and then the timer stops when the beam of the second sensor is blocked. Suppose that a cart is moving toward the right when it blocks the first sensor and then later the cart blocks the second sensor. The distance between the sensors is measured to be.0 cm with a possible error of.0 cm and the time interval recorded by the sensors is recorded to be 0.35 seconds with a possible error of 0.03 seconds. a. What is the average speed of this cart? b. What will be the maximum possible error in the speed of this cart? 9. A car travels West at 35 mph for a time period of.5 hours and then travels West at 55 mph for an additional time of 4.0 hours. How far will this car be from its starting point at the end of the journey? 10. A car is to travel a distance of 5 miles in 4.0 hours. During the first two hours the car travels with an average speed of 5 mph. What must the average speed of the car be during the second two hours in order to arrive at its destination on time? ANSWERS TO THE OPPOSITE SIDE: m/s/s mph m/s m/s m/s mph/s 17a. 0.4 m/s, 1. m/s,.04 m/s,.94 m/s, 3.6 m/s 17b..6 m/s, 7.7 m/s, 9.0 m/s, 9. m/s 17c..6 m/s 17e. +/ m/s, +/- 1. m/s

2 PHYSICS HOMEWORK # DISPLACEMENT & VELOCITY KINEMATICS 11. The speed of an automobile increases from.0 m/s to a speed of 30.0 m/s over a time period of 6.0 seconds. What is the average rate at which the speed of this car is changing during this time period? 1. A car is moving with a speed of 65.0 mph when a squirrel runs into the road in front of your car. The driver then hits the brakes and reduces the speed of the car to 5.0 mph over a time period of.00 seconds. What is the average rate at which the speed of the car decreases during this time period? 13. The speed of a cart increases from rest to a speed of 5.5 m/s over a period of 1.0 seconds. What is the average rate of acceleration if this cart? 14. A speedboat is moving through the water at a speed of.0 m/s when the engine stalls. As a result the boat comes to a halt in 4.00 seconds. What is the average rate of acceleration for the boat? 15. A race car, moving initially with a speed of 15.0 m/s, is capable of accelerating at a rate of 6.0 m/s. What will be the speed of this car after accelerating for a time period of.00 seconds? 16. You are driving down the highway at a speed of 5.0 mph when your car accelerates at 55 mph in order to pass another car. What is the average acceleration of this car if this increase in speed occurs over a time period of 5.00 seconds? 17. A tickertape timer is to be used to measure the speed and acceleration of a block of wood dropped out of a second story window. While attached to a piece of tickertape threaded through a timer the following TIME and POSITION data are collected: TIME (sec) 0.00 sec 0.10 sec 0.0 sec 0.30 sec 0.40 sec 0.50 sec POSITION (+/- 0.3 cm) 0.0 cm 4. cm 17.0 cm 37.4 cm 66. cm cm SPEED ACCELERATION According to the above data; a. Determine the average speed during each of the time intervals above. b. Determine the average acceleration during each time interval. c. Determine the average acceleration during the entire 0.5 second time interval. d. Why are there only 5 answer spaces in the SPEED column of the table above and only 4 spaces in the ACCELERATION column? e. Based on the error estimates for the measured positions given in the table, what would be reasonable error estimates for the speeds and accelerations? ANSWERS TO THE OPPOSITE SIDE: steps South. 5.0 miles East mph mph m/s m/s 7a m/s b. 0.1 m/s c m/s d m/s 7e. maximum error > minimum error..5 m/s, +/ m/s miles mph

3 PHYSICS HOMEWORK #3 KINEMATICS GRAPHICAL ANALYSIS The following graph describes the position of an object as a function of time. 0. Displacement vs Time Displacement [m] Time [sec] Show all work on the paper in detail! Don t leave anything out! 1. On the graph above use a straight edge to draw a BEST FIT line.. What is the slope of the line that best fits this set of points? 3. What are the units of the slope of this line? 4. What would be a reasonable estimated error on the slope of this line? 5. What physical quantity does the slope of this line represent? 6. Determine the equation of this line using y = mx + b as your starting point. 7. Test your equation by using it to predict the displacement of the object at 0.4 seconds.. Make a bar graph comparing the prediction of your equation with the plotted displacement at 0.4 seconds. 9. Write a one sentence conclusion regarding the ability of your equation to predict the displacement of this object. 10. From your graph determine the average velocity of this object as a function of time. 11. From your graph determine the average acceleration of this object as a function of time. Answers to the opposite side:. ~ m/sec 4. ~ +/ speed or velocity

4 PHYSICS HOMEWORK #4 GRAPHICAL ANALYSIS The following graph describes the position of a moving object as a function of time. KINEMATICS Displacement vs Time 40 Displacement [m] Time [sec] Please show ALL work on the graph above. 1. On the graph above use a straight edge to draw in a straight line tangent to the above curve at 3.0 seconds.. What is the slope of the tangent line you have drawn? [Draw in the rise and run where appropriate, indicate the magnitudes of the rise and run and how each was calculated.] 3. What are the units of this tangent line? [Show how you arrived at your answer!] 4. What would be a reasonable estimated error on the slope of this tangent line? [Again show ALL of your work!] 5. What physical quantity is represented by this tangent line? How did you reach this conclusion? Answers to the opposite side:. ~ m/sec 4. ~ +/ speed or velocity 6.D=(~0.73 +/ m/sec)t ~ 0.73 m/sec m/sec [slope is constant]

5 PHYSICS HOMEWORK #5 KINEMATICS GRAPHICAL ANALYSIS The following graph describes the velocity of an automobile as a function of time. 1. What was the velocity of this car when t=35seconds?. What was the rate of acceleration of this car when t=0seconds? 3. What was the rate of acceleration of this car when t=5seconds? 4. What was the rate of acceleration of this car when t=40seconds? 5. What was the displacement of this car between t=0andt=10seconds? 6. What was the displacement of this car between t=10andt=5seconds? 7. What was the displacement of this car between t=5andt=35seconds?. What was the total displacement of this car between t = 0 and t = 110 seconds? 9. What was the total distance traveled by this car between t = 0 and t = 110 seconds? 10. During which time interval/intervals was the car at rest? 11. During which interval/intervals was the car moving in reverse? 1. On the graph at the right sketch the acceleration of this car as a function of time.

6 PHYSICS HOMEWORK #6 GRAPHICAL ANALYSIS 13. At what times t [other than at t= 0] was the displacement of the car again exactly zero? KINEMATICS Answers to opposite side: 1..0 m/sec. 1.0 m/sec m/sec m/sec 5. 0 m/sec m/sec 7. 0 m/sec. -.5 m/sec m 9. Graph at right Answers to opposite side: m/sec. zero m/sec 4.cannot be determined because this point lies on two different lines with two different slopes! m 6. zero m m m 10. between t=10sandt=5s,at45sandat110s 11.between t=5s andt=45s 13.t=~39sec&t=~51sec 1.sketch a vs t to the right

7 PHYSICS HOMEWORK #7 ACCELERATION KINEMATICS The following graph describes 1 ( vf vo ) D the acceleration of an f at vot Do v f at vo D vt v automobile as a function of time. For each of the following questions assume that this car is at rest at t=0seconds. 1. What was the rate of acceleration of this car when t = 10 seconds? Set up a data. What was the rate of acceleration of this car when table for ALL t = 40 seconds? problems! 3. What was the rate of acceleration of this car when t = 50 seconds? D 4. What was the rate of acceleration of this car when o = t = 5 seconds? D f = 5. What was the velocity of this car when t = 10 seconds? v o = 6. What was the velocity of this car when t = 30 seconds? v f = 7. What was the velocity of this car when t = 50 seconds? a =. What was the velocity of this car when t = 100 seconds? t = 9. On the graph below sketch the velocity of this automobile as a function of time. 10. What was the total distance traveled by this car between t=0andt=30seconds?

8 PHYSICS HOMEWORK # ACCELERATION KINEMATICS 1. A car is at rest on a horizontal surface. The accelerator is applied and the car accelerates at 3.00 m/s ; a. What will be the speed of this car after 6.50 seconds? b. What will be the average speed of this car during these 6.50 seconds? c. How far will this car move during these 6.50 seconds?. Suppose that another car is moving with a speed of.5 m/s when the brakes are applied so as to slow the car down at a rate of -.5 m/s ; a. What will be the speed of this car 3.55 seconds after the brakes are applied? b. How far will this car move during this 3.55 second period? c. How long will it take for this car to stop? d. How far will this car move from the time that the brakes are applied until the car comes to a stop? 3. Suppose that the space shuttle Columbia accelerates at 14.0 m/s for.50 minutes after takeoff; a. What will be the speed of the shuttle at the end of.50 minutes? b. How far will the shuttle have traveled during this time? 4. A ball is dropped from the top of a building to the ground below. Assuming that the acceleration of gravity is -9.0 m/s and that it takes.7 seconds for this ball to reach the ground; a. What will be the speed of this ball as it reaches the ground? b. What is the average speed of the ball as it falls to the ground? c. How tall is the building? 5. A ball is thrown straight upward with an initial speed of 5.0 m/s; a. What will be the speed of this ball when it reaches the highest point? (Think!) b. What will be the speed of this ball just as it returns to the ground? c. How long will it take for this ball to reach the highest point? d. How high will the ball be when it reaches the highest point? e. What will be the speed of this ball after 3.5 seconds? f. What will be the average speed of this ball during this same 3.5 second period? 6. You are standing on the top of a building 135 meters tall. You throw a ball upward with a velocity of.0 m/s. At the exact same moment a friend throws a second ball upward from the ground with a velocity of 46.0 m/s. these two balls then collide at some later time. a. How long after these two balls are released will they collide? b. Where will these two balls be when they collide? c. What will be the velocity of each ball just as they collide? d. What will be the relative velocity between these two balls at the moment they collide? Answers to opposite side: 7a s b. 3. s c s, 0.73 s d m/s e. zero 7 f. 314 m g m/s h. 4.1 s i m/s m 9a. 1.5 s b. 6.3 m m m/s m/s 13. same speed, -59 m/s 14a m/s b. m 15a. 4. s & 3.5 s b m & 166 m c. 4.0 m/sec

10 PHYSICS HOMEWORK #10 VECTOR ADDITION KINEMATICS If two vectors are parallel, the sum of two vectors can easily be determined by just adding or subtracting the magnitudes of the two vectors. [Note! A vector, which is a directed line segment, can be used to represent any physical quantity which requires both direction and magnitude for a complete description.] Examples: a. 3.0 miles North +.0 miles North = 5.0 miles North b..0 miles East miles West = 3.0 miles East c. d.

11 PHYSICS HOMEWORK #11 KINEMATICS DISPLACEMENT & VELOCITY If two vectors are perpendicular then they can be added together by using the Pythagorean Theorem in combination with the inverse tangent [tan -1 ] function R m tan 35. / o tan ( 1. 4) o R 4. 3mat54. 5 SE o o ( or ES or ) If the two vectors to be added are neither parallel nor perpendicular then each vector must first be broken up into vector components that are either parallel or perpendicular. For example; The resultant R goes from the tail of the first vector to the tip of the last vector, as shown. Note how these two vectors have been connected together TIP TO TAIL! The first quantitative step in adding these two vectors together is to break each vector into components that are either parallel or perpendicular to the x and y axes.the resultant R goes from the tail of the first vector to the tip of the last vector as shown. Be x 1 = cos 35 o = i y 1 = sin 35 o = 10.3 j x = 1 cos 50 o = 7.71 i y = 1 sin 50 o = 9.19 j After these two vectors have been broken into components then these components must be added together. Since all i vectors are in the same direction [parallel to the x axis] they can be added together just like scalars as shown in parts a-d. Likewise, all j vectors are in the same direction [parallel to the y axis], and can therefore be added together arithmetically. y 1 = sin 35 o = 10.3 j x = 1 cos 50 o = i +y = 1 sin 50 o = 9.19 j +x = 1 cos 50 o = 7.71 i 19.5 j -7.0 i

12 PHYSICS HOMEWORK #1 KINEMATICS DISPLACEMENT & VELOCITY These two components can then be added together using the pythagorean theorem to find the resultant! R m tan / tan ( 79. ) and therefore the final answer is o R 1mat70 NW ( or 0 o 0 o WNor110 ) Note that since the resultant is a vector the final answer has both a magnitude [how long is the vector] and a direction [what is the angle]! BOTH are required for full credit in any vector problem! Determine the resultant of the following two vectors! Organize and show your work carefully and completely! Answer: 19.5 m at.5 o SE Sketch the resultant of the following three vectors! Be sure to indicate the direction of each vector with an arrow head and label the resultant vector R!

15 PHYSICS HOMEWORK #13 TWO DIMENSIONAL PROJECTILES [Remember that ALL vectors must be described by BOTH magnitude and direction!] 1. A ball, which has a mass of 3.35 kg., is thrown straight up from the ground with an initial velocity of 55.0 m/s; a. How long will it take for this ball to reach the highest point? b. How high above the ground will this ball be when it reaches the highest point? c. What will be the velocity of this ball when it reaches the ground again?. A marble, which has a mass of 4 grams, is dropped from a height of 94 cm. How long will it take for this marble to reach the floor? 3. A marble is rolling along a horizontal tabletop, which is 94.0 cm above the floor, when the marble reaches the edge of the table and then falls to the floor. How long will it take for the marble to strike the floor? 4. A rifle bullet, which has a mass of 57.0 grams, is fired horizontally from a rifle which is held 94.0 cm above the floor, with a velocity of 35 m/s. How long will it take for the bullet to strike the floor? 5. A marble is fired horizontally from a launching device attached to the edge of a tabletop which is 94.0 cm above the floor. The marble then strikes the floor.35 meters from the edge of the table. a. How long will it take for the marble to reach the floor? b. What is the initial velocity of the marble as it leaves the launching device? c. What will be the horizontal velocity of the marble as it reaches the floor? d. What will be the vertical velocity of the marble as it reaches the floor? e. What will be the direction and magnitude of the velocity of the marble as it reaches the floor? 6. A projectile is fired from the ground with a velocity of 96.0 m/s at an angle of 35.0 O above the horizontal; a. What will be the vertical and horizontal components of the initial velocity of this projectile? b. How long will it take for this projectile to reach the highest point of its trajectory? c. How long will this projectile be in the air? d. What will be the velocity of this projectile at the highest point? e. What will be the velocity of this projectile as it again reaches the ground? f. How high will this projectile be at the highest point of its trajectory? g. What will be the range [the horizontal displacement] of this projectile? KINEMATICS Remember to set up TWO data tables, one for the vertical and 7. A projectile, which has a mass of 5.5 kg., is fired from the ground with a an initial velocity of 169 m/s at an angle of 3.0 O above the horizontal; a. What will be the velocity of this projectile at the highest point of its trajectory? b. What will be the total flight time of this projectile? c. What will be the height of this projectile at the highest point of its trajectory? d. What will be the range of this projectile? e. What will be the vertical velocity of this projectile 3.50 seconds after it has been fired? f. What will be the horizontal velocity of this projectile 3.50 seconds after it has been fired? g. What will be the direction and magnitude of the projectile s velocity 3.50 seconds after it has been fired? h. What will be the height of this projectile 3.50 seconds after it has been fired? i. How far downrange will the projectile be 3.50 seconds after it has been fired? j. What will be the final displacement of the projectile 3.50 seconds after the projectile has been fired? Answers to opposite side: s b m c. 0 m d. 1 m/s at 1.0 o down e m at 16 o upward f. 9.7 s & 10.3 s g. 07 m/s 9a. 0.3 s b. 440 m 9c. 430 m/s at 14. o downward m 11a..1 s b. 75 m c..3 m 1a s 1b. 3. ft c. 3.0 ft 13a ft 13b..04 s

16 PHYSICS HOMEWORK #14 TWO DIMENSIONAL PROJECTILES KINEMATICS. A projectile is fired from the ground with an initial velocity of 5 m/sat an angle of 43.5 O above the horizontal; a. How long will this projectile be in the air? b. How high will this projectile be at the highest point of its trajectory? c. What will be the range of this projectile? d. What will be the velocity of this projectile.0 seconds after it has been fired? e. What will be the displacement of the projectile.0 seconds after it has been fired? f. When will this projectile be 1500 meters above the ground? g. What will be the velocity of this projectile at the highest point of its trajectory? Remember to set up TWO data tables, one for the vertical and 9. A rifle is fired from the top of a building 0 meters high with an initial velocity of 45 m/s at an angle of 1.0 O above the horizontal; a. How long will it take for the bullet to reach the ground? b. How far from the base of the building will the bullet strike the ground? c. What will be the velocity of the bullet just as it reaches the ground? 10. A Spanish Galleon enters a harbor defended by cannon placed on top of a castle wall which is 135 meters above the water level. The cannon have a known muzzle velocity of 33 m/s and are aimed.0 O above the horizontal. How far from the base of the castle wall will the Galleon be within the range of the cannon? 11. A motor cycle is moving with a velocity of 36.0 m/s when it encounters a ramp which is.0 meters long and meets the horizontal at an angle of 13.0 O. The motorcycle goes up the incline without losing speed and flies off the end of the incline; a. How long after the motorcycle leaves the end of the ramp will the motorcycle land on the ground? b. How far from the end of the ramp will the motorcycle land on the ground? c. How high above the ground will the motorcycle be at its highest point? 1. Suppose that a baseball is thrown horizontally from a pitcher s mound, which is 1.50 feet above the ground level, to home plate located 60.0 feet away. The ball is released from the pitchers hand with a velocity of 139 feet/second when the pitcher s hand is 5.30 feet above the mound. Ignoring the effects of air friction and given that the acceleration of gravity is g = -3. feet/second ; a. How long will it take for the ball to reach home plate? b. What will be the height of the ball above the ground when it reaches home plate? c. How far did the ball drop on its way to home plate? 13. Suppose that a shotputter throws a 16 pound shot with a velocity of 43 ft/s at an angle of 45 O. At the time the shot is released the shotputter s hand is 6.5 feet above the ground. a. What will be the final horizontal displacement of this shot? [World men s record 74 ft 4¼ in 199, women s record 73 ft 10 in 1977] b. How long will it take for this shotput to strike the ground? Answers to opposite side: s b. 154 m c m/s s s s 5a s b 5.3 m/s c. 5.3 m/s d m/s e. 6. m/s at 39 O downward 6a. 55 m/s, 79 m/s 6b s c. 11. s d. 79 m/s e. 96 m/s at 35 O downward f. 154 m g. 7 m 7a. 156 m/s 7b s c. m d. 100 m e m/s f. 156 m/s g. 159 m/s at 11.5 O up h. 171 m 7i. 545 m j. 571 m at 17.4 O upward

19 PHYSICS HOMEWORK #1 FIRST LAW OF MOTION NEWTON S LAWS Newton s First Law of Motion In the absence of an unbalanced, external force the velocity of an object remains constant! 1. For each of the following, complete the free body diagram showing all of the forces acting on the mass M. Be sure to show the direction of each force as an arrow and label each force clearly! [For example; T, F N, F f,f g,f a,f s etc.] a. b. c. d. e. f. Answers to opposite side #: a. 39. N b. 39. N N 4b. 539 N 4c. 539 N 4d. 5.0 N 5b. 361 N 5c. 53 N 6a N 6b. 49 N 6c..0 N 7a N 7b. 7.3 N b. 77 N c. 147 N

20 PHYSICS HOMEWORK # FIRST LAW OF MOTION NEWTON S LAWS

21 PHYSICS HOMEWORK #3 FIRST LAW OF MOTION 9. A string is tied between two support points as shown to the right. A mass of m 1 = 3.0 kg is hung from the string as shown. As a result the string makes an angle of = 5.0 o and = 41.0 o. What will be the tensions, T and T 3, in the string? NEWTON S LAWS T T 3 m 1 T 1 T T A string is tied to a hook in the ceiling. A mass of m = 6.00 kg is hung from the end of this string such that the mass hangs from the ceiling. A second string is tied to the first string at a point. This second string is then threaded through a pulley as shown to the left and a second mass of m 1 =.50 kg is suspended from it. a. What will be the tensions in each of the three segments of string? b. What is the angle shown in the diagram? m 1 m 11. A tightrope walker, who has a mass of m = 65.0 kg., is walking along a tightrope stretched between two buildings. The walker is standing part way across the rope as shown. The angle between the rope and the roof of the left building is = 19.0 o while the angle between the rope and the roof of the right building is =.0 o. What will be the tensions T 1 and T in each half of the rope? Tie Cable T 1 F Winch Cable M T 1. Consider a large crane which is being used to lift a heavy load of M =,000 kg. To the top of cabin of the crane there is attached a steel cable T 1 which is connected to the end of the boom. The angle between cable T 1 and the boom is = 5.0 o. A second cable T has one end attached to the load while the other end of the cable is attached to a winch at the base of the cabin after passing over a large pulley at the upper end of the boom. The angle between cable T and the boom is = 56.0 o. The mass M is being lifted upward at a constant speed. a. What will be the tension T in the cable lifting the load? b. What will be the tension T 1 in the tie cable? c. What will be the magnitude of the thrust force F being exerted by the boom? Answers to opposite side: 13b. 75 N 13c. 6 N 13d. 115 N 14a. 49 N 14b. 3 N 14c d N 17a. 1 N 17b. 194 N 17c. 171 N. 30 N 19a. 63. N 19b. 40 N 19c N

22 PHYSICS HOMEWORK #4 FORCE OF FRICTION 13. A rope is being used to pull a sled along a horizontal surface at a constant speed with an applied force of F = 15 N as shown to the right. The sled, including the load, has a mass of m 1 =.0 kg. The angle between the rope m F and the horizontal is = 3.0 o 1 as shown. a. Complete the free body diagram showing all the forces acting on the sled as it is pulled along this horizontal surface at a constant speed. b. What is the magnitude of the gravitational force acting on this sled as it is pulled to the right at a constant speed? c. What will be the magnitude of the normal force acting on this sled as it is pulled to the right at a constant speed? d. What will be the magnitude of the frictional force acting on the sled as it is pulled to the right at a constant speed? 14. A block of wood, which has a mass of m = 5.00 kg., is at rest on a horizontal surface. A spring scale is attached to a hook on the end of the block. The spring scale is slowly pulled until the block just begins to move. At this point the reading on the scale is 9.0 N. After the block starts sliding the reading on the scale drops back to 3.0 N. a. What is the magnitude of the normal force acting on this block? b. What is the magnitude of the frictional force on this block as it slides along the surface at a constant speed? c. What is the coefficient of static friction s between the block of wood and the horizontal surface? d. What is the coefficient of kinetic friction k between the block of wood and the horizontal surface? 15. A 4.00 kg mass is sitting at rest on a horizontal surface. A horizontal force of 9.30 Newtons is needed to start this mass sliding across the surface. What is the coefficient of static friction s between the mass and the surface of the table? 16. A 35.0 kg crate is sitting on a horizontal surface where the coefficient of sliding friction is k = How much force must be applied to this crate in order to slide the crate across the surface at a constant speed? 17. A sled, which has a mass of m =.5 kg., is sitting on a concrete driveway. The coefficient of static friction between the sled and the driveway is s =0.0 while the coefficient of kinetic friction is k = a. What will be the normal force acting on his sled? b. How much horizontal force must be applied to this sled in order to start it sliding across the driveway? c. How much horizontal force must be applied to keep this sled in motion along the driveway at a constant speed?. A car, which has a mass of 150 kg., is moving along an icy highway at a speed of 35.0 mph. The coefficient of kinetic friction between the tires of the car and the road is k = The driver applies the brakes so as to lock the wheels. How much frictional force is available to bring the car to a halt? 19. A sled, which has a mass of m = 45.0 kg., is sitting on an icy horizontal surface which has a coefficient of kinetic friction of 1 = A rope is attached to the front end of the sled such that the angle between the rope and the horizontal is =.0 o and a force F is applied to the rope so as to pull the sled along the horizontal surface at a constant speed. a. What is the magnitude of the frictional force F f acting on this sled? b. What is the magnitude of the normal force F N acting on the sled? c. What is the magnitude of the force F applied to the rope of the sled? NEWTON S LAWS Answers to opposite side: N, 4.5 N 10a. 4.5 N, 5. N, 63.7 N 10b. o N, 769 N 1a. 176,000 N 1b. 346,000 N 1c. 41,000 N

23 PHYSICS HOMEWORK #5 FIRST LAW & FRICTION 0. A crate, which has a mass of 65.0 kg., is sitting at rest on an inclined plane as shown to the right. The angle between the incline and the horizontal is = 13.0 o. a. Complete the free body diagram showing all the forces acting on the crate. b. What is the magnitude of the normal force acting on this crate? c. What is the magnitude of the frictional force acting on this crate? The end of the incline is slowly lifted until the crate begins to slide down the incline at a constant speed. At this point the angle between the incline and the horizontal is = 34.0 o. d. What is the coefficient of static friction between the crate and the surface of the incline? 1. A sled, which has a mass of m = 15 kg., is sitting on an icy horizontal surface. A rope is attached to the front end of the sled such that the angle between the rope and the horizontal is = 33.0 o and a force of 95.0 N is applied to the rope. As a result the sled moves along the horizontal surface with a constant speed. a. Complete the free body diagram showing all the forces acting on the sled. b. What is the magnitude of the frictional force acting on this sled? c. What is the magnitude of the normal force acting on the sled? d. What is the coefficient of sliding friction between the sled and the icy horizontal surface? NEWTON S LAWS. You would like to push a piano, which has a weight of 550 lbs, onto the bed of a truck which has a height of 3.5 ft above the road surface. You have available a long inclined plane which is 15.0 ft long and which has a coefficient of rolling friction of r = 0.0. How much force F would you have to apply to roll the piano up the incline and onto the truck bed? F 3. A mass of m 1 = 6.00 kg is sitting on an inclined plane, which meets the horizontal at an angle of =.0 o, as shown to the right. A string is attached to mass m 1, which is strung over a pulley, and is then attached to a second mass m = 4.00 kg. A slight push is given to m1 and as a result m 1 slides up the incline at a constant speed v. a. What is the magnitude of the tension T 1 in the string connecting the two masses? b. What will be the coefficient of sliding friction m k between mass m 1 and the surface of the incline? Answers to opposite side #6: 4a. 143 N 4b. 40. N 5a b N 6a N 6b N N. 09 N 9a. 10 N 9b. 50,400 N

24 PHYSICS HOMEWORK #6 FIRST LAW & FRICTION 4. Two masses are sitting on a horizontal surface as shown to the right. The coefficient of sliding friction between these two masses and the horizontal surface is k = A string is attached to the end of mass m 1 =.00 kg. This string is then looped around a pulley and is finally attached to the left vertical surface. The pulley is attached to mass m = 1.0 kg as shown and then a force F is applied to m such that m moves toward the right at a constant velocity of 5.0 m/sec. a. What will be the magnitude of the force F needed to pull mass m to the right at a constant speed? b. What will be the tension T in the string? NEWTON S LAWS 5. Two masses, m 1 = 3.0 kg and m = 7.0 kg. are sitting on a horizontal surface as shown to the right. The two masses are attached together by a string in which the tension is T. A force F = 67.0 N is applied to the system so as to pull the two masses to the left at a constant speed. a. What will be the coefficient of sliding friction k for this surface? b. What will be the tension T in the string connecting the two masses together? F m 1 T m 6. Two masses are arranged as shown. Mass m 1 has a mass of 4.00 kg and is attached to the vertical surface on the left with a string in which the tension is T. Mass m = 6.00 kg, is sitting on the horizontal surface and is being pulled to the right by a force F so that m is moving to the right at a constant speed. The coefficient of sliding friction between m 1 and m is 1 = 0.30 while the coefficient of sliding friction between m and the horizontal surface is = a. What will be the tension T in the string? b. What will be the magnitude of the force F required to pull m to the right at a constant speed? 7. In the diagram at the right m =.00 kg. is sliding down the incline at a constant speed. m 1 is being pulled by a string attached between these two masses. The coefficient of kinetic friction between m 1 and the horizontal surface is 1 = 0.0 while the coefficient of kinetic friction between m 1 and the incline is = The angle between the incline and the horizontal is = 4.0 o. What is the mass of m 1?. The coefficient of kinetic friction between the tires of a car, which has a mass of 1650 kg., and the road is k = while the coefficient of static friction is s = How much more frictional force is available to the driver of this car when the car is NOT in a skid? 9. A scissors jack is a common configuration for a simple jack used to lift a car to replace a flat tire. The diagram at the left shows the basic configuration of such a jack. The force F is generally supplied by a screw which is turned by a lug wrench. Assume that the angle in the diagram is = 15.0 o. a. What will be the magnitude of the force F required to lift a mass of M = 450 kg? b. What will be the magnitude of the force F if the angle is = 5.0 o? Answers to opposite side: 0b. 61 N 0c. 143 N 0d b N 1c N 1d lb 3a. 39. N 3b

25 PHYSICS HOMEWORK #7 TORQUES AT EQUILIBRIUM NEWTON S LAWS 1. A force of 45.0 Newtons is applied at a right angle to a lever which is 1.50 meters long. What will be the magnitude of the applied torque?. A force of F = 54.0 Newtons is applied to a lever which is R = 4.0 cm long as shown in the diagram to the right. What is the magnitude of the applied torque? 3. What will the magnitude of the applied torque in the diagram to the left where a force of F = 54.0 N is applied to a lever R = 1.5 meters long at an angle of = 35.0 o? 4. How much force F would have to be applied perpendicularly to a lever arm of r =.0 cm. in order to generate a torque of 7.0 N m? Torque r F r F sin( ) 5. A force of F 1 =.0 N is applied at a distance of R 1 = 3.0 cm from the center of rotation as shown to the right. How much force must be applied at point A, which is R = 16.0 cm from the center of rotation, in order to produce rotational equilibrium? 6. A screw driver has a handle which has a diameter of 3.50 cm. How much force F must be applied tangentially to the handle of the screwdriver to generate a torque of 7.00 Nm? 7. Where X in the diagram to the right should the F = 4.0 N force be applied in order to balance the F 1 = 4.0 N force which is applied R 1 = 75.0 cm. from the center of rotation as shown?. How much force F should be applied at point D in the diagram below in order to produce rotational equilibrium in the diagram to the left where F 1 = 14.0 N, F = 4.0 N, R 1 = 40.0 cm., R =.0 cm. and R 3 = 34.0 cm.? 9. The diagram below shows a meter stick resting on two ring stands. Different masses are hung from the meterstick, which has a mass of 135 grams. A mass of m 1 = 50 gm is suspended from the meter stick at the 0.0 cm mark, a mass of m = 500 grams is suspended from the 40.0 cm mark of the meterstick and m 3 = 150 grams is suspended from the 70.0 cm mark of the meterstick as shown.what will be the magnitude and point of application of the single upward force that can lift this meterstick? [Complete the diagram to the right & select a center of rotation!] ANSWERS TO OPPOSITE SIDE : 10a N m b N m c..57 N m d. 9.0 N gm lb N 14a. 9.0 N b m 15. left = 94 lb, right = 96.1 lb

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