Momentum&impulse - Assessment

1.

Multiple Choice

1 min

1 pt

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N s.

-2.5

-10

-18

-45

2.

Multiple Choice

1 min

1 pt

A 0.250 kg cart moving at 0.400 m/s has how much momentum?

0.1 kg-m/s

1 kg-m/s

10 kg-m/s

100 kg-m/s

3.

Multiple Choice

45 sec

1 pt

Softer landings tend to

increase impact force

increase force

increase collision time

increase change in momentum

4.

Multiple Choice

1 min

1 pt

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

5.

Multiple Choice

1 min

1 pt

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

6.

Multiple Choice

1 min

1 pt

The units for Impulse are

N/s

N.s

N

m/s

7.

Multiple Choice

30 sec

1 pt

Cart A is pulled with a 2 Newton force for 2 seconds, and Cart B is pulled with a 1 Newton force for 3 seconds. Which cart experiences the greatest impulse?

Cart B

Cart A

they are the same

8.

Multiple Choice

5 mins

1 pt

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.
Calculate the impulse on the ball.

1 N.s

6 N.s

66 N.s

None of these

9.

Multiple Choice

1 min

1 pt

The purpose of crumble zones on a car is to

decrease time of impact.

increase force of impact.

increase the time of impact.

decrease the impulse during impact.

10.

Multiple Choice

1 min

1 pt

In an isolated system, the net ____ on that system is zero.

external force

internal force

time interval

displacement

11.

Multiple Choice

1 min

1 pt

The impulse-momentum theorem states that

the impulse on an object is equal to the change in momentum it causes

the force on a moving object is equal to the magnitude of the impulse.

the impulse on an object is greater than the change in momentum it causes

the impulse on an object is less than the change in momentum it causes

12.

Multiple Choice

30 sec

1 pt

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 velocity?

6.3 m/s

3.2 m/s

1.2 m/s

4.33 m/s

13.

Multiple Choice

30 sec

1 pt

If an air bag changes a 60 kg person's speed from 40.0 m/s to 0.0 m/s, what impulse must act on the person?

2400 kg.m/s

1.5 kg.m/s

0.67 kg.m/s

1500 kg.m/s

14.

Multiple Choice

30 sec

1 pt

The velocity of a 975-kg car is changed from 12.0 m/s to 27.0 m/s in 15s by an external, constant force. What is the magnitude of the force?

9.75×10² N

1.46×10⁴N

9.75×10³ N

975 kg·m/s

15.

Multiple Choice

30 sec

1 pt

A force acted upon an object for 3 s as shown in the graph below.
What is the magnitude of the impulse on the object?

3

4.5

6

9

16.

Multiple Choice

30 sec

1 pt

what is the objects momentum for 8 m/s

6

8

10

12

17.

Multiple Choice

30 sec

1 pt

what is the object's velocity for momentum of 6 kg.m/s?

2

4

6

8

18.

Multiple Choice

30 sec

1 pt

can a bullet have the same momentum as a truck?

yes

no

19.

Multiple Choice

30 sec

1 pt

What is the object's mass?

1 kg

2 kg

1.5 kg

2.5 kg

20.

Multiple Choice

1 min

1 pt

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

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