Cycle II Regents Physics

John Dewey High School

Mr. Klimetz

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 N

15. 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

Aluminum

Brass

Copper

Steel

A 10.-kilogram block of each of these materials is pulled horizontally across a steel floor at constant

velocity. Which block requires the smallest applied force to keep it moving at constant velocity?

(1) aluminum (2) brass (3) copper (4) steel

29. An 800-N person is standing in an elevator. If the upward force of the elevator on the person is 600 N,

the person is

(1) at rest (2) accelerating upward (3) accelerating downward (4) moving downward at constant speed

30. A 0.10-kilogram model rocket's engine is designed to deliver an impulse of 6.0 N-s. If the rocket engine

burns for 0.75 s, what average force does it produce?

(1) 4.5 N (2) 8.0 N (3) 45 N (4) 80. N

31. A granite block is being slid at constant speed across a horizontal concrete floor by a force directed

parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for

the granite on the concrete?

(1) mass and speed of the block

(2) mass and normal force on the block

(3) frictional force and speed of the block

(4) frictional force and normal force on the block

32. A man standing on a scale in an elevator notices that the scale reads 30 N greater than his normal

weight. Which type of movement of the elevator could cause this greater-than-normal reading?

(1) accelerating upward

(2) accelerating downward

(3) moving upward at constant speed

(4) moving downward at constant speed

33. An astronaut weighs 800. N on the surface of the Earth. What is the weight of the astronaut

6.37 x 10exp6 m above the surface of the Earth?

(1) 0.00 N (2) 200. N (3) 1,600 N (4) 3,200 N

34. When a 12-N horizontal force is applied to a box on a horizontal tabletop, the box remains at rest.

The force of static friction acting on the box is

(1) 0 N (2) between 0 N and 12 N (3) 12 N (4) greater than 12 N

35. Ball A of mass 5.0 kilograms moving at 20. m/s collides with Ball B of unknown mass moving at

10. m/s in the same direction. After the collision, Ball A moves at 10. m/s and Ball B at 15 m/s,

both still in the same direction. What is the mass of Ball B?

(1) 6.0 kg (2) 2.0 kg (3) 10. kg (4) 12 kg

36. A 1.5-kilogram lab cart is accelerated uniformly from rest to a speed of 2.0 m/s in 0.50 s. What

is the magnitude of the force producing this acceleration?

(1) 0.70 N (2) 1.5 N (3) 3.0 N (4) 6.0 N

37. Which person has the greatest inertia?

(1) a 110-kg wrestler resting on a mat

(2) a 90-kg man walking at 2 m/s

(3) a 70-kg long-distance runner traveling at 5 m/s

(4) a 50-kg girl sprinting at 10 m/s

38. If the sum of all forces acting on a moving object is zero, the object will

(1) slow down and stop

(2) change the direction of its motion

(3) accelerate uniformly

(4) continue moving with constant velocity

39. A spring scale reads 20. N as it pulls a 5.0-kg mass across a table. What is the magnitude of the

force exerted by the mass on the spring scale?

(1) 49 N (2) 20. N (3) 5.0 N (4) 4.0 N

40. A 1.2-kg block and a 1.8-kg block are initially at rest on a frictionless, horizontal surface. The 1.2-kg

block is on the left and the 1.8-kg block is on the right. When a compressed spring between the

blocks is released, the 1.8 kg block moves to the right at 2.0 m/s. What is the speed of the 1.2 kg

block after the spring is released?

(1) 1.4 m/s (2) 2.0 m/s (3) 3.0 m/s (4) 3.6 m/s

0.47

0.57

0.36

0.44