# AP PHYSICS C Mechanics - SUMMER ASSIGNMENT FOR

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1 AP PHYSICS C Mechanics - SUMMER ASSIGNMENT FOR Dear Student: The AP physics course you have signed up for is designed to prepare you for a superior performance on the AP test. To complete material in the textbook and still have fun, exciting and educational labs and associated lab reports we must pass quickly through dimensional analysis other basic topics. I have included copies of chapter 1 of your text book and chapter 2 of a non-calculus based text book, some basic Math questions and a link to a useful web site to warn you up for the beginning of fall semester. No textbook is needed to complete the assignment but you are expected to have a text book on the first day of class. This summer assignment is due on Wednesday at the beginning of class. There will be a quiz on that first day of class. The text book has answers to some problems in chapter 1; if you have the book you can check your answers and do corrections. The summer assignment is worth 100 homework points and is due in Wednesday , written on a separate paper, with clear headings and your name. I will not accept summer assignment after the beginning of the lesson. Have it ready to hand in. Note if insufficient work is shown because it was all done on your calculator, your calculator will be credited with half the points for the summer assignment. I will be available during the summer holidays at the following times June 15th till July 1st till and from August 7th; you may contact me by to make arrangements to meet if you are having problems with the assignment. You should aim to start the assignment as soon as possible and to complete it before July 1st. Sincerely Mr D. Darling Dana.Darling@jserra.org

3 Name 1. AP Physics math review PART I. SOLVING EQUATIONS Solve the following equations for the quantity indicated. 1. y 1 2 at 2 Solve for t 2. x vot 1 2 at 2 Solve for v o 2 3. v ax Solve for x v 4. a f v t o Solve for t v 5. a f v t o Solve for v f 1

4 Name 6. F k m m r Solve for r 7. F k m m 1 2 Solve for m 2 2 r 8. T 2 L g Solve for L 9. T 2 L g Solve for g f do di Solve for d i 11. qv 1 mv 2 2 Solve for v (not V and v are not the same quantity) 2

5 Name 12 PART II. SCIENTIFIC NOTATION The following are ordinary physics problems. Write the answer in scientific notation and simplify the units. 1. Ts kg kg s K kg m s N m (3.2x10 C)(9.6x10 C) F 9x C (0.32 m) R p R p = 5. e J J J 3

6 Name 1.33 sin sin 6. θ = Kmax ( J s)( s ) -( J)= m s m s PART III. FACTOR-LABEL METHOD FOR CONVERTING UNITS A very useful method of converting one unit to an equivalent unit is called the factor-label method of unit conversion. You may be given the speed of an object as 25 km/h and wish to express it in m/s. To make this conversion, you must change km to m and h to s by multiplying by a series of factors so that the units you do not want will cancel out and the units you want will remain. Conversion: 1000 m = 1 km and 3600 s = 1 h, 25 km 1000 m 1 h h 1 km 3600 s What is the conversion factor to convert km/h to m/s? What is the conversion factor to convert m/s to km/h? Carry out the following conversions using the factor-label method. Show all your work! 1. How many seconds are in a year? 4

7 Name 2. Convert 28 km to cm. 3. Convert 45 kg to mg. 4. Convert 85 cm/min to m/s. 5. Convert the speed of light, 3x10 8 m/s, to km/day. 6. Convert 823 nm to m x10-8 m to mm x10 11 m to μm m 2 to cm 2 5

8 Name cm 3 to m 3 PART IV. TRIGONOMETRY AND BASIC GEOMETRY Solve for all sides and all angles for the following triangles. Show all your work. Example: SOH CAH TOA sin θ = opp hyp cos θ = adj hyp tan θ = opp adj Your calculator must be in degree mode! Show all your work. 1. = 55 o and c = 32 m, solve for a and b 2. = 45 o and a = 15 m/s, solve for b and c. 3. b= 17.8 m and = 65 o, solve for a and c. 4. Line B touches the circle at a single point. Line A extends through the center of the circle. What is line B in reference to the circle? B How large is the angle between lines A and B? A C 6

9 Name What is line C? 5. Write down the magnitude of 30 º o 6. The radius of a circle is 5.5 cm, a. What is the circumference in meters? b. What is its area in square meters? 7. What is the area under the curve below? Show your work and include the appropriate units. v (m/s) t (s) 7

10 Name PART V. GRAPHING TECHNIQUES Graph the following sets of data using proper graphing techniques. The first column refers to the y-axis and the second column to the x-axis 1. Plot a graph for the following data recorded for an object falling from rest: Velocity (ft/s) Time (s) a. What kind of curve did you obtain? b. What is the relationship between the variables? c. What do you expect the velocity to be after 4.5 s? 8

11 Name d. How much time is required for the object to attain a speed of 100 ft/s? 2. Plot a graph showing the relationship between frequency and wavelength of electromagnetic waves: Frequency (khz) Wavelength (m) a. What kind of curve did you obtain? b. What is the relationship between the variables? c. What is the wavelength of an electromagnetic wave of frequency 350 Hz? d. What is the frequency of an electromagnetic wave of wavelength 375 m? 9

12 Name 3. In an experiment with electric circuits the following data was recorded. Plot a graph with the data: Current (A) Power (W) a. What kind of curve did you obtain? b. What is the relationship between the variables? c. What is the power when the current is 3.2 A? d. What is the current when the power is 64.8 W? 10

13 Name Part VI Solving quadratic equations: Solve each of the following quadratic equations. Obtain your answers in surd, not decimal, form. 11

14 Name 12

15 Name Part VII Graphs Types of graphs Graphs are VERY important in physics because they show patterns between variables. A straight line graph that starts from the (0,0) point is the best proof that two variables are directly proportional. Straight line graph You should know from your math that the general equation for a straight line is, where a is the gradient of the graph and b is the point that the line cuts the y-axis. y ax b y b a x You must also know from your maths the equation for a hyperbola, a parabola, an ellipse etc. Make your own table including all the graph shapes you know and their functions. Make sure you include the logarithmic and exponential functions. Search on line to find examples in Physics. Function Graph Example in physics y ax b 13

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17 Name How to choose the right graph for plotting Although the above list is important, when it comes to finding a relationship between two variables the only graph that can show this very clearly is the straight line graph. EXAMPLE Let s say that you want to prove the relationship between the kinetic energy of an object and its velocity. You plot velocity on the x-axis and kinetic energy on the y-axis. You will get a curve which as you now is a parabola (since the kinetic energy is directly proportional to the square of the velocity). Now let s say you do another experiment that, unknown to you, also follows the same pattern. You will also get a curve when you plot the graph. Will you be able to recognize that this is a parabola? What if it is a curve that is very close to a parabola but not quite? What can you do to be sure that you have cracked the relationship? Think again about the example above. If instead of plotting kinetic energy against velocity you plot kinetic energy against velocity squared what will you get? You will get a straight line through zero! Moreover, you will be certain that the relationship is that: the kinetic energy is directly proportional to the velocity squared. So what have we learned so far? ALWAYS AIM AT PLOTTING TWO VARIABLES THAT WILL GIVE YOU A STRAIGHT LINE! Here are some examples: To prove that resistance R is inversely proportional to cross sectional area A, plot R against 1 A. This should give you a straight line. To prove that the square of the period T length l plot either T 2 against l of a pendulum is directly proportional to its or T against l NOW TRY THIS! 1. The pendulum equation is: T 2 l g a) What variables should you plot against each other in order to prove that the period of the pendulum does not depend on its mass? What will the shape of this graph be? 15

18 Name b) What variables should you plot against each other to prove that the period depends on the gravitational field strength as shown by the equation? 2. The universal gravitational law is given by the equation: F G mm 2 r a) What variables should you plot against each other in order to prove that the attractive force (F)is directly proportional to both masses (mm) of the objects? b) What variables should you plot against each other in order to prove that the attractive force is inversely proportional to the distance squared (r 2 ) between the objects? The significance of the gradient During your coursework you will be asked to decide which graphs to plot in order to show a relationship or to calculate a physical constant. We have already noted how important it is to aim at plotting a graph that will end up being a straight line. This gives you a definite answer about the relationship between the two variables. But there is more to it. The gradient of this line will give you information about a constant in your experiment. EXAMPLE Let s say that you want to measure the gravitational field strength of Earth with a 2 pendulum. You vary the length and measure the period. You then decide to plot T 16

20 Name xd L (double slit interference) xd L 1 x axis : d y axis : x x axis : L gradient gradient (wavelength) (double slit y axis : x interference) (wavelength) Apart from its use as explained above, the gradient in all lines (curved or straight) corresponds to the derivative of the function you plot. This is why if you plot time on the x-axis and displacement on the y-axis the gradient corresponds to the velocity of the object. If the line is curved the gradient does not stay the same, which means that it is equal to the instantaneous velocity of the object. For the same reason if you plot time on the x-axis and velocity on the y-axis the gradient corresponds to the acceleration of the object. If the line is curved the gradient does not stay the same, which means that it is equal to the instantaneous acceleration of the object. The significance of the area under a graph The area between a graph of y = f(x) and the x-axis is equal to the definite integral of the function. This formula gives a positive result for a graph above the x-axis, and a negative result for a graph below the x-axis. [9] This is why the area under a velocity-time graph is equal to the distance covered by the object. If the graph is a straight line then the area under can be calculated very precisely as the area of a triangle or trapezium etc. If the line is a curve, the area is often estimated to a good precision before it can give you some useful information. 18

21 Name Part VIII Word problems Have a look at these word problems and try to solve them. Problem 1 Anna has 800 apples in baskets. Each basket holds 16 apples. How many baskets does she have? Problem 2 John has 147 pears in 21 baskets. How many baskets does he need for 14 pears? Problem 3 The weight of a 50.0 kg person on the moon is 80.0N. How much would a 72.0 kg person weigh on the moon? Problem 4 When stereo sound information is transmitted through a cable, 32 bits are sent every 22.7μs. Calculate how many bits you can send during 2 seconds (2 s = 2 x 10 6 μs) 19

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