1. What is the momentum of a 30-kilogram cart moving with a speed of 10 meters per second?
(1) 20 kg-m/s (2) 40 kg-m/s (3) 3 kg-m/s (4) 300 kg-m/s
2. If a 3.0-kilogram object moves 10. meters in 2.0 seconds, its average momentum is
(1) 60. kg-m/s (2) 30. kg-m/s (3) 15 kg-m/s (4) 10. kg-m/s
3. A mass with a momentum of 40. kg-m/s receives an impulse of 30. N-s in the direction of its motion.
The final momentum of the mass is
(1) 1.3 kg-m/s (2) 10. kg-m/s (3) 70. kg-m/s (4) 1,200 kg-m/s
4. The product of an object's mass and velocity is equal to
(1) force (2) weight (3) displacement (4) momentum
Base your answers to questions 5 and 6 on the following information and your knowledge of Physics.
Block A moves with a velocity of 2 m/s to the right along a horizontal, frictionless surface.
It then collides with Block B which is at rest. Block A stops moving, and Block B moves
to the right after the collision. Block A possesses a mass of 5 kg.
5. What is the combined momentum of Blocks A and B before the collision?
(1) 0 kg-m/s (2) 10 kg-m/s (3) 20 kg-m/s (4) 40 kg-m/s
6. What is the total change in momentum of Blocks A and B?
(1) 0 kg-m/s (2) 20 kg-m/s (3) 40 kg-m/s (4) 200 kg-m/s
7. Two carts of masses 5.0 kilograms and 1.0 kilogram are pushed apart by a compressed spring.
If the 5.0-kilogram cart moves westward at 2.0 m/s, the magnitude of the velocity of the 1.0-kilogram
cart will be
(1) 2.0 kg-m/s (2) 2.0 m/s (3) 10. kg-m/s (4) 10. m/s
8. If the sum of all the forces acting on a car is zero, then the speed of the car always
(1) decreases (2) increases (3) remains the same
9. Which statement about the movement of an object with zero acceleration is true?
(1) The object must be at rest.
(2) The object must be slowing down.
(3) The object may be speeding up.
(4) The object may be in motion.
10. If the mass of a moving object could be doubled, the inertia of the object would be
(1) halved (2) doubled (3) unchanged (4) quadrupled
11. What is an essential characteristic of an object in equilibrium?
(1) zero velocity (2) zero acceleration (3) zero mass (4) zero speed
12. The force required to accelerate a 2.0-kilogram mass at 4.0 m/sexp2 is
(1) 6.0 N (2) 2.0 N (3) 8.0 N (4) 16 N
13. A 30-kilogram boy exerts a force of 100 N on a 50-kilogram object. The force that the object exerts
on the boy is
(1) 0 N (2) 100 N (3) 980 N (4) 1,500 N
14. Two bodies attract each other with a gravitational force of 10.0 N. What will be the force of attraction
if the mass of each body is doubled?
(1) 5 N (2) 10 N (3) 20 N (4) 40 N15. Two objects of equal mass are a fixed distance apart. If the mass of each object could be tripled, the
gravitational force between the objects would
(1) decrease by 1/3rd (2) triple (3) decrease by 1/9th (4) increase 9 times
16. If the distance between two masses were tripled, the gravitational force between them would be
(1) 1/9th as great (2) 1/3rd as great (3) 3 times as great (4) 9 times as great
17. As a space ship from Earth travels to the Moon the force it exerts on the Earth
(1) decreases (2) increases (3) remains the same
18. If the mass of one of two particles is doubled and the distance between them is doubled, the force
of attraction between the two particles will
(1) decrease (2) increase (3) remain the same
19. If the mass of an object were doubled, its weight would be
(1) halved (2) doubled (3) quadrupled (4) unchanged
20. A 2.0-kilogram mass is pushed along a horizontal frictionless surface by a 3.0-N force which is
acting parallel to the surface. The weight of the mass is approximately
(1) 9.8 N (2) 2.0 N (3) 20. N (4) 4.0 N
21. In order to keep an object weighing 20 N moving at constant speed along a horizontal surface, a force
of 10 N is required. The force of friction between the surface and the object is
(1) 0 N (2) 10 N (3) 20 N (4) 30 N
22. Which road surface would offer the greatest traction for rubber tires?
(1) dry concrete (2) wet concrete (3) dry asphalt (4) wet asphalt
23. As more force is applied to a steel box sliding on a steel surface, the coefficient of kinetic friction will
(1) decrease (2) increase (3) remain the same
24. Jim wished to push a 100. N wooden crate across a wood floor. What is the minimum horizontal force
that would be required to start the crate moving?
(1) 30. N (2) 42 N (3) 72 N (4) 100 N
25. Jill is pulling a 200. N sled through the snow at constant velocity using a horizontal force of 10. N.
What is the coefficient of kinetic friction of the sled on the snow?
(1) 0.02 (2) 0.05 (3) 0.20 (4) 20
26. What is the minimum horizontal force needed to start a 300. kg steel block resting on a horizontal
steel table in motion?
(1) 5.70 N (2) 7.40 N (3) 1710 N (4) 2,220 N
27. Which statement explains why a book resting on a table is in equilibrium?
(1) There is a net force acting downward on the book.
(2) The weight of the book equals the weight of the table.
(3) The acceleration due to gravity is 9.80 m/sexp2 for both the book and the table.
(4) The weight of the book and the table's upward force on the book are equal in magnitude but
opposite in direction.
28. The values below reflect the coefficients of kinetic friction for four materials sliding over steel
