Question

20, This picture is an example of ____________

Elastic Collision

Inelastic collision

21,

This picture is an example of ____________

Elastic Collision

Inelastic collision

22,

The law of conservation of momentum states that the total momentum of all objects interacting with each other will ________________________ no matter of the nature of the forces between the object.

increase

decrease

remain constant

fluctuate

23,

This is an example of what kind of collision?

Elastic

Inelastic

24,

What is Newton's Law of Conservation of Momentum?

Object in motion stays in motion and an object at rest stays at rest unless acted on by a outside force

Force = mass x acceleration

For every action there is an equal and opposite reaction

Momentum can not be created or destroyed without outside forces

25,

True/False: Elastic Collision causes a rebound.

True

False

26,

Which of the following does NOT affect momentum?

Mass

Speed

Direction

Color of Object

27,

A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?

25 m/s

375 m/s

25 kg m/s

375 kg m/s

28,

A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?

6030 kg

0.0134 kg

74.4 kg

80 kg

29,

The purpose of crumple zones on a car is to

decrease time of impact.

increase force of impact.

increase the time of impact.

decrease the impulse during impact.

30,

The difference between a car hitting a wall vs. a car hitting a hay stack is

the Impulse on the car hitting the wall is greater

the change in momentum of the car hitting the wall is greater

the force on the car hitting the hay stack is greater

the collision time of the car hitting the hay stack is greater

31,

A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the change in the object's momentum?

45 kg m/s

72 kg m/s

32.4 kg m/s

0.45 kg m/s

32,

In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other. The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s. The carts stick together when they collide. Calculate their final speed.

0.5 m/s

1.0 m/s

0.33 m/s

0.67 m/s

33

If two objects have the same mass, then the faster moving object has ____________ momentum.

more

less

the same

34,

While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue ball's velocity was 10 m/s and the 8 ball was at rest. If both ball's have a mass of 0.15 kg and the cue ball's velocity after the collision is 2 m/s, what is the 8 ball's velocity?

2 m/s

8 m/s

-2 m/s

1.5 m/s

35,

The total momentum before a collision is _________ the total momentum after a collision.

equal to

less than

more than

It depends on the type of collision

36,

A 0.40 kilogram bird is flying at a constant speed of 8.0 m/s. What is the bird's kinetic energy?

3.2 J

4.2 J

2.0 J

12.8 J

37,

A 2600 kilogram car is moving at a speed of 25 m/s. How much kinetic energy does the car have?

427,500 J

237,500 J

812,500 J

537,500 J

Answer 1