2. (P2.1 A) a) A car travels 150 km in 3 hours, what is the cars average speed?

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1 Physics: Review for Final Exam 1 st Semester Name Hour P2.1A Calculate the average speed of an object using the change of position and elapsed time 1. (P2.1 A) What is your average speed if you run 140 m in 60 seconds? 2. (P2.1 A) a) A car travels 150 km in 3 hours, what is the cars average speed? b) Does this mean the cars speed was always this value? Why or why not? P2.1B Represent the velocities for linear and circular motion using motion diagrams (arrows on strobe pictures). 3. (P2.1 B) Draw a motion diagram that shows an object with a constant velocity. 4. (P2.1 B) Draw a motion diagram that shows an object with increasing velocity. 5. (P2.1 B) Draw a motion diagram that shows an object with decreasing velocity. P2.1C Create line graphs using measured values of position and elapsed time. 6. (P2.1C) Draw a graph that represents the measurements below. Time (s) Position (m) (P2.1C) Draw a graph that represents the measurements below. Time (s) Position (m) (P2.1C) Draw a graph that represents the measurements below. Time (s) Object A Position (m) Object B Position (m)

2 P2.1D Describe and analyze the motion that a position- time graph represents, given the graph. 9. (P2.1D) In the above graph, which time interval is the car moving the fastest? 10. (P2.1D) In the above graph, between which time interval is the car not moving? 11. (P2.1D) In the above graphs, which shows the greatest constant positive acceleration? 12. (P2.1D) In the above graphs, which shows zero acceleration? P2.1g Solve problems involving average speed and constant acceleration in one dimension. 13. (P2.1g) If we are driving up north at 65 mph and been traveling for 4 hours how far have we traveled? 14. A skier slides down a ramp with an acceleration of m/s 2 for 3 seconds. What is the skier s average velocity? 15. (P2.1g) How much time does it take to drive to the lake if we travel 150 miles driving 55 mph? P2.2A Distinguish between the variables of distance, displacement, speed, velocity, and acceleration. 16. (P2.2A) Explain why velocity is a vector quantity. 17. (P2.2A) If you walk 100 meters to the west and turn around and walk 30 meters to the east, what is your displacement? 18. (P2.2A) Suzy walks to the store 12m away and back in 18s. (Sketch Suzy s motion to help you solve.) a) What is the distance traveled? b) What is the displacement? c) What is the average speed? d) What is the velocity?

3 P2.2B Use the change of speed and elapsed time to calculate the average acceleration for linear motion. 19. (P2.2B) A bike has an initial velocity of +12 m/s. It slows down with an acceleration of -0.8 m/s 2. How long until it stops? 20. (P2.2B) A bike has an initial velocity of 12 m/s. It speeds up with an acceleration of 0.8 m/s 2. How fast is it going after 4 seconds? 21. (P2.2B) A ball is dropped from a tall building. Ignoring air resistance, what would its velocity be after 6.2 seconds? P2.2C Describe and analyze the motion that a velocity- time graph represents, given the graph. 22. (P2.2C) Which of the graphs below represents the motion of a car traveling at a constant velocity? V e l o c I t y Time (s) 23. (P2.2C) On the graph above, at what time are objects 1 and 4 travelling at the same velocity? 24. (P2.1C) On the graph above, draw a line representing a 5 th object that has the same acceleration of object 1 having lower initial speed.

4 P3.4e Solve problems involving force, mass and acceleration in two dimensional projectile motion restricted to an initial horizontal velocity with no initial vertical velocity (e.g., a ball rolling off a table). t = 2 s 25. Considering the diagrams above, what is the horizontal speed at t = 2 seconds? 26. A brick is thrown horizontally with a speed of 18 m/s from the top of a building. If it hits the ground 3 seconds later, how tall is the building? 27. Bob and Cliff are throwing rocks out of the 10 th floor window. Bob mishandles his rock and falls to ground while, at the same time, Cliff throws his rock with a horizontal speed of 10 m/s. Which one hits the ground first? 28. An airplane flying at a constant horizontal speed of 100 m/s drops a package. If it continues at a constant horizontal speed of 100 m/s, where will the plane be (relative to the package) when the package hits the ground? ( sketch the picture) P3.1A Identify the force(s) acting between objects in direct contact or at a distance. 29. (P3.1A) Give two different examples of a force at a distance. 30. (3.1A) When an object is thrown straight up into the air (ignore air resistance) what force(s) are acting on the object at its highest point? 31. (3.1A) Why does a hockey puck slide across an icy surface easier than a cement floor?

5 P3.2A Identify the magnitude and direction of everyday forces (e.g., wind, tension in ropes, pushes and pulls, weight) 32. You are standing on a deck in your back yard. The force of gravity pulls you down with a force of 520 N. What prevents you from accelerating downward at 9.8 m/s 2? 33. What is the direction of the net force on a forward truck if it is slowing down? 34. If you are hanging from a motionless rope off your roof, your weight is 520 N. What is the tension force on the rope? 35. Consider the diagram below where forces are balanced. Describe how the object could be moving. 36. Consider the diagram to the right. If the object is moving, which pair of forces will dictate its direction of motion? 37. Draw a free body diagram of a car moving at a constant speed toward the left. P3.2C Calculate the net force acting on an object. 38. Horizontal forces are applied to a 20.0-newton wooden block as shown in the drawing below. The net force causes the wooden block to move across a wooden floor. Calculate the net force acting on the wooden block. 39. A truck is being pushes forward by a man with a force 150 N. The friction from the road on the truck is 50 N. What is the force on the truck? 40. A 600 N box is held up by two ropes, as in the figure to the right. One rope supports 400 N, what is the magnitude and direction of the force on the other rope? 41. A car has a mass of 1500 kg. It accelerates from rest at 5m/s 2. What is the net force on the car?

6 P3.3A Identify the action and reaction force from examples of forces in everyday situations (e.g., book on a table, walking across the floor, pushing open a door). 42. A baseball bat hits a ball with a force of 50 N. How much force is exerted on the bat by the ball? 43. A boy pushes on a tree with 25 N of force. With how much force does the tree push back on the boy? P3.4A Predict the change in motion of an object acted on by several forces. 44. Draw a free body diagram of an object in equilibrium, at rest and at a constant velocity. Equilibrium At Rest Constant Velocity 45. Consider the diagram below; describe the motion of the object. P3.4C Solve problems involving force, mass, and acceleration in linear motion (Newton s second law). 46. An object is observed to have an acceleration of 2 m/s2 when a net force of 4 N is applied. The mass of the object is: 47. A 0.25-kilogram ball is observed to accelerate at 4,000 m/s2 as it is hit with a bat. How much force is exerted on the bat by the ball? 48. A girl pulls upward on a 10 kg box with a force of 200 N. What is the acceleration of the box?

7 P2.1F Distinguish between rotation and revolution and describe and contrast the two speeds of an object like the Earth. 49. What is the difference between Earth s revolution and rotation and how long does each take? 50. Give an example of an object that is both rotating and revolving. P2.2D State that uniform circular motion involves acceleration without a change in speed. 51. Uniform circular motion includes both speed and constant centripetal. 52. An object is moving at constant speed with uniform circular motion. In what direction is the acceleration of the object? 53. A child is riding on a merry-go-round in uniform circular motion. Explain why the child is considered to be accelerating even though her speed is not changing. P3.4D Identify the force(s) acting on objects moving with uniform circular motion (e.g., a car on a circular track, satellites in orbit). 54. What force causes the circular motion of a car making a left or right hand turn at a corner? 55. What force causes the circular motion of a planet in its orbit about the Sun? P3.6B Predict how the gravitational force between objects changes when the distance between them changes. 56. What is the effect of gravitational forces as two objects move closer to one another? 57. What is the effect of gravitational forces as the distance between two objects is doubled?

8 58. Draw a graph that represents the data below. What relationship is shown by your graph? Distance Between Objects (km) Gravitational Force (N) P3.6d Calculate force, masses, or distance, given any three of these quantities, by applying the Law of Universal Gravitation, given the value of G. 59. If you went to a planet that has the same mass as the Earth but the radius was larger, would you weigh more on that planet? Explain. 60. What is the gravitation force between a 60 kg person and a 110 kg person separated by 0.5 m?

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