Name: Ryann Class: Date: ID Physics 20 Practice Final Exam Multiple Choice Identify the choice that best completes the statement or answers the question. A 1. Kinematics is the branch of physics that a. explains the cause of the motion of objects b. identifies the forces that acton objects C. describes the motion of objects d. studies the energy of objects 2. Below is a position-time graph of a car moving east. Position-Time Graph 35.0 25 .0 Position (m[E]) 20.0 0.0 5.0 10.0 15.0 20.0 Time (s) The velocity of the car when 10.0 s have elapsed is c. 20.0 m/s [east] a. 20.0 m/s d. 2.00 m/s [east] b. 2.00 m/sID : A Name: C 4. Bel Name: Below are velocity-time, position-time, and acceleration-time graphs for moving objects. Graphs for Moving Objects II. Velocity -Time Graph Velocity-Time Graph Velocity Mising Velocity [misINn - 1-- 1.0 20 30 4.0 5.0 -6.0 80 -0.01.0 - 2.0 30 4.0 5.0 6.0 Time (S) Time (s IV. III. Acceleration-Time Graph Position-Time Graph 6.0 5.0 2 4.0 INWACO Position [m[ND) = 3.0 9 0.0 - 0.0 1.0 2.0 3.0 4.0 5.0 6.0 1.0 2.0 3.0 4.0 5.0 6.0 Time (s) Time (S) 3. Refer to the information in Graphs for Moving Objects to answer this question. The slope of graph I represents a. velocity c. displacement b. acceleration d. instantaneous velocityV : aII Name: C 4. Below is a velocity-time graph for an in-line skater on the way to school. ID: A Velocity-Time Graph 9.0 8.0 7.0 6.0 5.0 Velocity (m/s[Forward] 4.0 3.0 2.0 1.0 0.0 5.0 10.0 15.0 20.0 Time (s) After 15.0 s of skating, the magnitude of the displacement of the skater is a. 1.2 x 102 m C . 8.0 m b. 15 m d. 0 m B 5. Which of the descriptions below are for situations involving dynamics? I A soccer player exerts a force of 100 N on the ball to kick it toward the goal. II The maximum speed a cheetah can reach on Earth is about 113 km/h. III The force of gravity on a person on the moon is less than on Earth. IV The acceleration of a ball drop toward Earth is 9.81 m/s. Choose your answer from the following. c. I and IV only a. I and II only d. I and III only b. III and IV onlyName: 6. A gardener applies a force to the handle of a ame: trimming lawn mower, as shown. The angle re between the handle and the horizontal is 45. Fapp When the applied force is resolved into horizontal and vertical components, which 450 statement is correct? O The horizontal component is greater than the vertical component. The horizontal component is less than the vertical component. O' C. Each component is less than the applied force. d. Each component is greater than the applied force. 7. What concept or principle best explains why steel barrier cab the cab of a truck is often separated from the load by a steel barrier? load a. acceleration C . the normal force b. _the force of friction d. Newton's first law 8. An 8.0-kg oak block, X, on a horizontal, rough oak surface is attached by a light string that passes over a light, frictionless pulley to a hanging 4.0-kg mass, Y. The magnitude of the force of friction on block X is 24 N. What is the magnitude of the acceleration of Y the system? ( g = 9.81 m/s2 [down]) a. 1.3 m/s2 b. 1.9 m/s2 C. 3.3 m/s2 d. 3.8 m/s2Name: 9 . ID: A The diagram shows three locations in the path of an imaginary planet travelling in its orbit about a star S. At what point in its orbit is the magnitude of the gravitational force of the star on the planet the largest? a. I b . II C. III d. The gravitational force on the planet is the same at all locations. 10. A 15.0 g solution in a test tube is placed in a centrifuge that spins at a rate of 2.50 x 10' Hz. What is the centripetal force exerted on the solution if the radius of the circular motion is 12.0 cm? a. 23.6 N C. 2.96 x 105 N b. 5.33 x 102 N d. 4.44 x 103 N 11. A car has wheels with a radius if 42.0 cm. If the car is travelling at a speed of 90.0 km/h, what is the frequency of rotation of its wheels? 9.47 HZ C. 0.0942 Hz a. b. 4.74 Hz d. 34.1 Hz 12. A 26.0 kg mass is travelling in a circle with a radius of 45.0 m. If the force required to maintain a cons speed is 375 N, what is the period of this motion? C . 9.01 s a. 1 1.1 s d. 12.8 s b. 13.6 sName: The diagram shows a pendulum bob that 13. If a satellite is to orbit Earth at an altitude of 1.00 x 103 km, What would be its orbit Diagram is not to scale. a. 1.27 x 103 s ummm CP 169 x 105-s b. 6.29 x 103 s d. 3.30 x 107 s 7. If a satellite travels in a circular orbit about Earth at a speed of 1.6% % to my, what must be ; PHHITTERIN Response radius? C. 147 x 108 m a. 3.30 x 107 m d. 4.60 x 108 m b. 4.67 x 107 m 15 1.75 m 25.0 0 In the above diagram, a block of mass 0.750 kg is towed up an inclined plane tilted at an angle of 25.0 horizontal. The block is moved from point A to point B, a distance of 1.75 m, by a force of 22.5 N. Wh the block's change in gravitational potential energy when the it arrives at point B? a. 5.44 J C. 22.5 J 12.9 J d. 39.4 JIDC & Diagram is not to scale called to the right by an angle 16. Refer to the chore ofgran to conver shir question The pendulum has a length of 120 m and a bob of mass 2.50 kg. The pendulum bob is pulled sideways until it is 30.8 cm shove it's rest position. What will be its kinetic energy when it passes through the lowest point of is motion? 2.46 J 6.041 7.55 J 17. An small electric motor lifts s 12.5 kg mass to a height of 4.20 m in 75.0 s. What is the power output of the motor? 1.25 W C 6.87 W 526 W a. 7.46 W 18. Which of the following factors affect the period of a pendulum? I the length of the string supporting the bob II the mess of the bob Ill the acceleration due to gravity in the region of the pendulum 2 I and II C. I and III h. II and III d. I, II, and IIIC. 395 N d. 386 N Name: 23. To move a 65.0 kg mass 8.75 m up a frictionless plane in 5.20 s, a power cuffed HA a. 49.8 cm 19. What is the length of a pendulum on Earth that has a period of 1.00 32 C . What is the force that is exerted on the mass? 24.8 cm 12.8 cm d. 6.17 cm a. 532N 20. The equilibrium position of a wave is b. 4ION Name: a. the location of a crest or trough. 24. In order to save time, height of 2.00 m a b. any point at which the medium is not moving. to reach the Numeric Response C. half the distance between a crest and a trough. d. the position of the medium when there is no wave present. Segment of a Wave This diagram shows a segment of a wave travelling through a light spring. V T R 21. Refer to the diagram Segment of a Wave to answer this question. The wave segment is of a wave that is moving to the left through a spring. At the instant shown, which of the following is a correct description of the direction of motion of the spring at that point? I. Q is moving upward. II. Q is moving downward. III. S is moving upward . IV. S is moving downward. a. I and II C. I and IV b. II and III d. II and IV a. reflection. 22. The change in the pitch of a sound resulting from the motion of the source relative to an observer is called b. refraction. c. the Doppler effect. d. the Compton effect.V : QI . . . Name: ID: A 23. To move a 65.0 kg mass 8.75 m up a frictionless plane in 5.20 s, a power output of 6.90 x 10" W is required. What is the force that is exerted on the mass? a. 532 N b. 410 N C. 395 N 386 N Numeric Response 24. In order to save time, one worker decides to throw his apple up to his co-worker. He releases the apple from a height of 2.00 m above ground level with an initial velocity of 15.5 m/s. The time it will it take for the apple to reach the co-worker is _ _s. (Record your three-digit answer on the answer sheet.) 25. Use the following information to answer the next question. 7.50 kg 5.00 kg Consider the frictionless pulley system illustrated above. If the 7.50-kg block experiences a friction force of 12.8 N, the magnitude of the acceleration of this system is _m/s2. (Record your three-digit answer on the answer sheet.) 9