(A) the Same (B) Twice As Great (C) Four Times As Great (D) Half As Great

1. A stone is ties to a string and whirled at constant speed in a horizontal circle. The speed is then doubled without changing the length of the string. Afterwards, the magnitude of the acceleration of the stone is (a) the same(b) twice as great (c) four times as great (d) half as great 2. The mass and weight of a body (a) differ by a factor of 9.8 (b) are the same physical quantities expressed in different units (c) have the same ratio as that of any other body placed at that location (d) are both a direct measure of the inertia of the body 3. A physics textbook is suspended on a spring scale in an elevator. Of the following, the scale shows the highest reading when the elevator (a) moves upward with increasing speed (b) moves upward with decreasing speed (c) moves downward with increasing speed (d) moves downward at constant speed 4. A book rests on a table, exerting a downward force on the table. The reaction to this force is (a) the force of the earth on the book (b) the force of the table on the book(c) the force of the earth on the table (d) the force of the book on the earth 5. A horizontal force of 12 N pushes a 0.5 kg block against a vertical wall. The block is initially

at rest. If s= 0.6 and k= 0.4, which of the following is true? (a) the frictional force is 4.9 N (b) the frictional force is 7.2 N (c) the normal force is 4.9 N(d) the block will start moving and accelerate 6. The driver of a 1000 kg car tries to turn through a circle of radius 100 m on an unbanked curve at a speed of 10 m/s. The actual frictional force between the tires and slippery road is 900 N. The car will (a) slide into the inside of the curve (b) make the turn (c) slow down due to the frictional force (d) slide off to the outside of the curve. 7. An object moves in a circle at constant speed. The work done by the centripetal force is zero because (a) the displacement for each revolution is zero (b) the average force for each revolution is zero (c) there is no friction (d) the magnitude of acceleration is zero (e) the centripetal force is perpendicular to the velocity 8. A fly ball to left field is caught at the same height as it was originally hit. Over its entire flight the work done by gravity and the work done by air resistance, respectively, are: (a) zero; positive (b) zero, negative (c) positive, negative (d) negative, positive (e) negative, negative

9. Two objects with masses of m1 and m2 have the same kinetic energy and are both moving to the right. The same constant force F is applied to the left of both masses. If m1 = 4m2, the ration of the stopping distance of m1 to that of m2 is: (a) 1:4 (b) 4:1 (c) 1:2 (d) 2:1 (e) 1:1 10. The work expended to accelerate a car from 0 to 30 m/s (a) is equal to that required to accelerate it from 30 m/s to 60 m/s (b) is more than that required to accelerate it from 30 m/s to 60 m/s (c) is less than that required to accelerate it from 30 m/s to 60 m/s (d) may be any of the above, depending on the time taken (e) depends on the mass of the car. 11. Two skiers start at the same point near the top of the mountain and finish at the same place at the bottom. Skier A takes a smooth route to the finish, whereas skier B takes a curvy, bumpy route to the finish. Assuming friction to be negligible (a) Skier B has less speed at the finish because his route was curvy. (b) Skier A has a greater speed at the finish because his route was straight and smooth. (c) Skier B has less speed at the finish because his route was bumpy. (d) Skier A has the same speed as skier B at the finish. (e) Cannot conclude since the mass of the skiers are not given. 12. A person holds a 20 lb weight two feet above the ground for 30 s. The power required to do this is (a) 80 ft-lbs/s (b) 40 ft-lbs/s (c) 20 ft-lbs/s (d) 10 ft-lbs/s (f) none of the above 13. A force acting on a particle is conservative if (a) its work equals the change in the kinetic energy of the particle (b) It obeys Newton’s second law (c) it obeys Newton’s third law (d) its work depends on the end points of the motion, not on the path between them (e) it is not a frictional force 14. A woman pulls a crate up a rough, inclined plane at constant speed. Which of the following statements concerning the situation is false? (a) the gravitational potential energy of the crate is increasing (b) the net work done by all the forces acting on the crate is zero (c) the work done on the crate by the normal force of the plavne is zero (d) the woman does “positive work” in pulling the crate up the incline (e) the work done on the object by gravity is zero 15. A heavy truck and a light truck are both traveling at the same speed on the same roadway. If the coefficient of static friction between their tires and the road are the same, which vehicle will be able to stop in the shortest distance? (a) the car (b) the truck (c)both will be able to stop in the same distance (d) cannot tell with knowing their coefficient of kinetic friction (a) cannot tell without knowing their individual masses