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IMPULSE/MOMENTUM TEST 1

Total questions: 40

Worksheet time: 53mins

Name
Class
Date
1.
Which object has the greater momentum
a)
An elephant standing in a field
b)
A train resting in the rail yard
c)
A skateboard moving
d)
A boy sitting in a chair
2.
Which object has the least momentum?
a)
a 0.25 kilogram softball moving at 20 m/s
b)
a 7.25 kilogram bowling ball moving at 1 m/s
c)
a 2 kilogram rock moving at 3 m/s
d)
a 2 kilogram rock resting on a stump
3.
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?
a)
25 m/s
b)
375 m/s
c)
25 kg m/s
d)
375 kg m/s
4.
Which object listed below has the greatest momentum?
a)
A 0.05 kg object rolling at 0.2 m/s.
b)
A 0.15 kg object rolling at 2 m/s.
c)
A 0.15 kg object rolling at 1 m/s
d)
A 0.4 kg object rolling at 2 m/s.
5.
A 2 kg cart has a momentum of 16 kg m/s. What is its velocity?
a)
8 m/s
b)
32 m/s
c)
0.125 m/s
d)
18 m/s
6.
A change in momentum is called an ____________.
a)
impulse
b)
amperes
c)
force
d)
power
7.
If two objects have the same mass, then the faster moving object has ____________ momentum.
a)
more 
b)
less
c)
the same
8.
An egg is thrown at a wall and at a bed sheet. The force of impact will be
a)
Greater against the wall
b)
Greater against the sheet
c)
Force is equal
9.
The impulse experienced by an object is equal to the object’s change in ____________________________________.
a)
velocity
b)
mass
c)
momentum
d)
time
10.
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.
a)
1 N*s
b)
6 N*s
c)
33.3 N*s 
d)
None of these
11.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
12.
When the speed of an object is doubled, its momentum
a)
remains unchanged in accord with the conservation of momentum.
b)
doubles
c)
quadruples
d)
decreases
13.
The difference between a car hitting a wall vs. a car hitting a hay stack is
a)
the Impulse on the car hitting the wall is greater
b)
the change in momentum of the car hitting the wall is greater
c)
the force on the car hitting the hay stack is greater
d)
the collision time of the car hitting the hay stack is greater
14.
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.
a)
-2.5
.
.
b)
-10
c)
-18
d)
-45
15.

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The time for the collision is _____ seconds.

a)

1.8

b)

2.5

c)

3.6

d)

10

16.

Linear momentum is defined as the product of a system’s ______________ multiplied by its _____________:

a)

mass, velocity

b)

acceleration, mass

c)

acceleration, force

d)

force, mass

e)

force, velocity

17.
An object with a mass of 2000 kg at rest has what momentum?
a)
2000 kg m/sec
b)
0 kg m/sec
c)
2000 kg
d)
2000 m/sec
18.

A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball.

a)

55 kg*m/s

b)

100 kg*m/s

c)

250 kg*m/s

d)

500 kg*m/s

19.

Free Response: Write your answer in the space provided. Show the equation you used, ALL work, and then circle your answer!

a)

A loaded school bus has a mass of 5000 kg and is moving at 10 m/s. The bus is unloaded and travels at 15 m/s. If the bus has the same momentum in each case, what is the mass of the empty bus?

.

.

.

.

.

.

.

b)

A model jet rocket applies an impulse of 30 N*s over 2 s interval of time. What is the force applied?

.

.

.

.

.

.

.

c)

A group of people are pushing a stalled car with a mass of 1200 kg. If they push with a net force of 380 Newtons for 10 seconds, what is the car’s final velocity?

.

.

.

.

.

.

.

d)

A 3 kg rock is subject to the force of gravity for 8 s. What is the impulse?

.

.

.

.

.

.

.

20.

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.

a)

-2.5

b)

-10

c)

-18

d)

-45

21.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
22.
Softer landings tend to
a)
increase impact force
b)
increase force
c)
increase collision time
d)
increase change in momentum
23.
A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?
a)
6030 kg
b)
0.0134 kg
c)
74.4 kg
d)
80 kg
24.
The units for Impulse are
a)
N/s
b)
N.s
c)
N
d)
m/s
25.
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?
a)
Cart B
b)
Cart A
c)
they are the same
26.
The purpose of crumble zones on a car is to
a)
decrease time of impact.
b)
increase force of impact.
c)
increase the time of impact.
d)
decrease the impulse during impact.
27.
The impulse-momentum theorem states that
a)
the impulse on an object is equal to the change in momentum it causes 
b)
the force on a moving object is equal to the magnitude of the impulse.
c)
the impulse on an object is greater than the change in momentum it causes 
d)
the impulse on an object is less than the change in momentum it causes
28.
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? 
a)
6.3 m/s
b)
3.2 m/s
c)
1.2 m/s 
d)
4.33 m/s
29.
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? 
a)
 2400 kg.m/s
b)
1.5 kg.m/s
c)
0.67 kg.m/s
d)
1500 kg.m/s
30.
what is the objects momentum for 8 m/s
a)
6
b)
8
c)
10
d)
12
31.
what is the object's velocity for momentum of 6 kg.m/s?
a)
2
b)
4
c)
6
d)
8
32.

can a bullet have the same momentum as a truck?

a)

yes

b)

no

33.
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?
a)
25 m/s
b)
375 m/s
c)
25 kg m/s
d)
375 kg m/s
34.
When the speed of an object is doubled, its momentum __________.
a)
remains unchanged 
b)
doubles
c)
quadruples
d)
decreases
35.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
36.
The definition of momentum is
a)
Mass in Motion
b)
The size of an object
c)
The velocity of an object
d)
A comparison between two objects
37.
A runner has a momentum of 720 kg m/s and is traveling at a velocity of 5 m/s. What is his mass?
a)
14.4 kg
b)
1400 kg
c)
144 kg
d)
360 kg
38.
The units for Impulse are
a)
N/s
b)
N*s
c)
N
d)
m/s
39.
Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour?
a)
Both have the same momentum
b)
The small truck
c)
The large truck
d)
IDK
40.
In order to catch a ball, a baseball player moves his or her hand backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because
a)
the time of impact is decreased.
b)
the time of impact is increased.
c)
the velocity of the hand is reduced.
d)
the momentum of impact is reduced.

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