Momentum and Impulse (Alternative for page 102 )

1.

Multiple Choice

2 mins

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

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

3.

Multiple Choice

1 min

1 pt

A force of 221 N is applied to a 10 kg object for 0.4 seconds. Calculate the impulse experienced by the object.

88.4 Ns

4 Ns

2210 Ns

22.1 Ns

4.

Multiple Choice

2 mins

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

5.

Multiple Select

1 min

1 pt

Check ALL that apply.

Impulse is:

The force that creates an acceleration.

The change in momentum.

the change in velocity that can be caused by a constant force over some discrete amount of time.

A vector

NOT a vector

6.

Multiple Choice

3 mins

1 pt

A 60-kg student jumps down from the library counter. At the instant he lands on the floor his speed is 3 meters per second. If the student stops in 0.2 seconds, what is the average force of the floor on the student? Which formula do you use?

Imp=F*t

F= (mvf-mvi)/t

p=mv

vf - vi = (F*t)/m

7.

Multiple Choice

30 sec

1 pt

A mother pushes her 120-Newton child in a swing. If the mother exerts a 10-Newton force on the child for half a second, what is the magnitude of the impulse imparted to the child by the mother? What formula do you use:

p=mv

mvf-mvi=Ft

Imp=Ft

F=(mvf-mvi)/t

8.

Multiple Choice

30 sec

1 pt

If a ball that 2kg is dropped and hits the floor with a velocity of 10m/s in 1 second, then what is the change in momentum? Choose the right formula:

p=mv

mvf-mvi=/\p

Imp=Ft

F=(mvf-mvi)/t

9.

Multiple Choice

3 mins

1 pt

How do the following variables change if you drop an egg on a pillow rather than cement?

constant impulse, increasing time, decreasing force

increasing impulse, increasing time, increasing force

constant impulse, increasing time, increasing force

decreasing impulse, decreasing force, increasing time

10.

Multiple Choice

45 sec

1 pt

If you jump from an elevation, you bend your knees to allow for

you to catch your breath.

extend the time it takes to decrease your momentum.

decrease the time it takes to decrease your momentum.

increase the Force your knees experience.

11.

Multiple Choice

1 min

1 pt

To calculate impulse, the formula can include each of the following except:

Force x time

momentum initial - momentum final

mass (velocity final - velocity initial)

mass x velocity

12.

Multiple Choice

30 sec

1 pt

The unit for Force is

N

Ns

m/s

kg m/s

13.

Multiple Choice

30 sec

1 pt

The unit for momentum AND impulse:

kgm/s

N

m/s

seconds

14.

Multiple Choice

30 sec

1 pt

The unit for velocity:

m/s

N

Ns

kgm/s

15.

Multiple Choice

30 sec

1 pt

The unit for Impulse:

Ns

N

s

m/s

16.

Multiple Choice

45 sec

1 pt

The two factors that affect momentum are the

impact force and the impact time.

the impact force and the impact sound.

the impact force and the impact light.

the impact force and the impact heat.

17.

Multiple Choice

30 sec

1 pt

To change an object's momentum, it is necessary to apply a force against it's motion for a given period of ___________.

time.

beats.

momentum.

force.

18.

Multiple Choice

45 sec

1 pt

Which of the following will allow for an extended time of impact of an egg falling from a chicken coup ?

hay piled into a nest

asphalt road

tiles

concrete

19.

Multiple Choice

1 min

1 pt

A trapeze artist will experience the force weight of their body falling at the end of their act. Why do they land in a net?

A net increases the time of impact so impulse is increased.

A net increases the force the body experiences.

A net increases speed of impact.

A net increases the mass of the body.

20.

Multiple Choice

20 sec

1 pt

What is the unit of impulse?

N/s

Kg.m/s

N.s

Kg.m/s and N.s

None of the above

21.

Multiple Choice

45 sec

1 pt

All of the following are examples of impulse except..

A car moving with constant speed

A tennis ball hitting a racket

A pencil getting stuck to the ceiling

A hammer bouncing of a nail

22.

Multiple Choice

20 sec

1 pt

A baseball bat applies a force of 500 N to a ball for 0.1s. What was the impulse on the ball?

5 N . s

500 N .s

500 N/s

50 N.s

23.

Multiple Choice

30 sec

1 pt

The impulse is _____the change in momentum

Greater than

Equal to

Less than

Always double

24.

Multiple Choice

30 sec

1 pt

Softer landings tend to

increase impact force

increase force

increase collision time

increase change in momentum

25.

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

26.

Multiple Choice

2 mins

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.

27.

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

28.

Multiple Choice

30 sec

1 pt

Which one of the following units represents the standard metric units of momentum

Newtons * meter / second

Kilograms * meter / second²

meter / second

Kilograms * meter / second

29.

Multiple Choice

30 sec

1 pt

During a collision. an object experiences an impulse. How can this impulse be calculated?

Multiplying force by time

Multiplying mass by velocity

Dividing velocity by time

Multiplying mass by acceleration

30.

Multiple Choice

30 sec

1 pt

During a collision. an object experiences an impulse. The impulse causes and is equal to the _____ of the object

energy change

kinetic energy change

force

momentum

momentum change

31.

Multiple Choice

30 sec

1 pt

An egg landing on a soft surface will remain intact. The surface increases the _____ and decreases the _____ during the impact

impulse, time

impulse, force

force, time

time, force

32.

Multiple Choice

1 min

1 pt

Padded dashboards in cars are safer in accidents than non padded ones because the passenger hitting the dash has...

a) Increased time of impact

b) decreased impulse

c) decreased impact force

d) a and b

e) a and c

33.

Multiple Choice

1 min

1 pt

An egg gets dropped from a height of 0.1 meters and cracks. A second egg gets dropped from the same height but this time it lands on a glass of water and does not break. In terms of impulse.

1st egg experienced more impulse

2nd egg experienced more impulse

both experienced the same impulse

34.

Multiple Choice

1 min

1 pt

An egg gets dropped from a height of 0.1 meters and cracks. A second egg gets dropped from the same height but this time it lands on a glass of water and does not break. In terms of force and time, the second egg must have experienced...

more force, but less time

less force, but more time

more force, and more time

less force, and less time

35.

Multiple Choice

30 sec

1 pt

The air bag on a car reduces the force experienced by the driver, by extending the time of impact.

True

False

36.

Multiple Choice

30 sec

1 pt

What is the unit for mass?

kg m/s

m/s

kg

Ns

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