2004 AP Physics C Mech - Mechanics Multiple Choice 2004 1....

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Mechanics Multiple Choice – 2004 1. The graph above shows velocity v versus time t for an object in linear motion. Which of the following is a possible graph of position x versus time t for this object? 2. An object is dropped from rest from the top of a 400 m cliff on Earth. If air resistance is negligible, what is the distance the object travels during the first 6 s of its fall? (A) 30 m (B) 60 m (C) 120 m (D) 180 m (E) 360 m 3. A 2 kg ball collides with the floor at an angle θ and rebounds at the same angle and speed as shown above. Which of the following vectors represents the impulse exerted on the ball by the floor? 4. Three blocks of masses 3m, 2m, and m are connected to strings A, B, and C as shown above. The blocks are pulled along a rough surface by a force of magnitude F exerted by string C. The coefficient of friction between each block and the surface is the same. Which string must be the strongest in order not to break? (A) A (B) B (C) C (D) They must all be the same strength. (E) It is impossible to determine without knowing the coefficient of friction.
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Questions 5-6 A block of mass 3 kg, initially at rest, is pulled along a frictionless, horizontal surface with a force shown as a function of time t by the graph above. 5. The acceleration of the block at t = 2 s is (A) 3/4 m/s 2 (B) 4/3 m/s 2 (C) 2 m/s 2 (D) 8 m/s 2 (E) 12 m/s 2 6. The speed of the block at t = 2 s is (A) 4/3 m/s (B) 8/3 m/s (C) 4 m/s (D) 8 m/s (E) 24 m/s Questions 7-8 A sphere of mass M, radius r, and rotational inertia I is released from rest at the top of an inclined plane of height h as shown above. 7. If the plane is frictionless, what is the speed v cm , of the center of mass of the sphere at the bottom of the incline? (A) 2 gh (B) 2 Mgh I (C) 2 2 Mghr I (D) 2 2 Mghr I (E) 2 2 2 Mghr I Mr + 8. If the plane has friction so that the sphere rolls without slipping, what is the speed v cm of the center of mass at the bottom of the incline? (A) 2 gh (B) 2 Mgh I (C) 2 2 Mghr I (D) 2 2 Mghr I (E) 2 2 2 Mghr I Mr + 9. An object weighing 300 N is suspended by means of two cords, as shown above. The tension in the horizontal cord is (A) 0 N (B) 150 N (C) 210 N (D) 300 N (E) 400 N
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Questions 10-12 A small box is on a ramp tilted at an angle θ above the horizontal. The box may be subject to the following forces: frictional ( f ) ,gravitational ( mg ), pulling or pushing ( F P ) and normal (N) . In the following free-body diagrams for the box, the lengths of the vectors are proportional to the magnitudes of the forces. 10. Which figure best represents the free-body diagram for the box if it is accelerating up the ramp?
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This note was uploaded on 08/29/2010 for the course PHYS 45925 taught by Professor Ramesh during the Spring '10 term at University of California, Berkeley.

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2004 AP Physics C Mech - Mechanics Multiple Choice 2004 1....

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