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PSci Unit 8 Review- Motion with Momentum

Total questions: 144

Worksheet time: 5hrs 48mins

Name
Class
Date
1.
A dog runs on the sidewalk 9 mi/hr.
a)
Speed
b)
Acceleration
c)
Velocity
2.
While going to school, a student walks an average of 5 km/hr west for 12 blocks.
a)
Speed
b)
Acceleration
c)
Velocity
3.
While on a trip, a family travels east from San Antonio to Houston going 70 mph.
a)
Speed
b)
Acceleration
c)
Velocity
4.
Speed in a given direction is the definition of ____. 
a)
Speed
b)
Velocity
c)
Acceleration
d)
Direction
5.
A car traveling 300 miles in 5 hours is an example of _____. 
a)
Speed
b)
Velocity
c)
Acceleration
d)
Direction
6.
A ball rolling west at 5 cm per second is an example of ____. 
a)
Speed
b)
Velocity
c)
Acceleration
d)
Direction
7.
Distance over Time is the definition of ___. 
a)
Speed
b)
Velocity
c)
Acceleration
d)
Direction
8.
What is the formula to calculate speed?
a)
Speed = time/distance
b)
Speed = distance/time
c)
Speed = distance x time
d)
Speed = time x distance
9.
A car travels 30 miles/hr for 3 hours, calculate the distance it will travel
a)
90 miles
b)
10 miles
c)
600 miles
d)
90 km
10.
Which of the following is a unit of speed?
a)
km/hr
b)
hr
c)
km
d)
s
11.
Find the velocity of a plane that traveled 3000 miles west in 5 hours.
a)
65 mph west
b)
6 mph west
c)
600 mph west
d)
6000 mph west 
12.
88 m/s north
a)
Speed
b)
Velocity
c)
Acceleration
13.
88 m/s
a)
Speed
b)
Velocity
c)
Acceleration
14.
Which of the following is a unit of speed ?
a)
sec
b)
mi
c)
m/s
d)
min
15.
A truck driving at 60 miles per hour travels 150 miles. How long is it driving for?
a)
9000 hours
b)
0.4 hours
c)
210 hours
d)
2.5 hours
16.
A roller coasters accelerates from an initial velocity of of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?
a)
24 m/s2
b)
18 m/s2
c)
16 m/s2
d)
16 m/s
17.
A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.
a)
2.2m/s2
b)
7.0m/s2
c)
5.7m/s2
d)
70m/s2
18.
Acceleration is defined as the CHANGE in 
a)
time it takes for one place to move to another place. 
b)
velocity of an object.
c)
distance divided by the time interval 
d)
velocity divided by the time interval 
19.
Acceleration only takes place when things speed up. 
a)
True
b)
False
20.
You are walking in a straight line at a consistent speed. Do you have acceleration? 
a)
no
b)
yes 
21.
As you walk you make a right turn. Do you have acceleration? 
a)
yes 
b)
no
22.
You are walking and start to slow down. Do you have acceleration? 
a)
yes
b)
no 
23.
A drag racer accelerated from 0 m/s to 200 m/s in 5 s.  What was the acceleration?
a)
0 m/s
b)
40 m/s2
c)
-40 m/s2
d)
40 m/s
24.

What is Acceleration?

a)

Speeding up

b)

Slowing down

c)

How fast something is moving

d)

Changing direction

25.
If a car going 30 m/s approaches a traffic jam and the driver hits the brakes, how long will it take for them to slow to a stop with at a rate of -6.25m/s2? 
Which equation will help you solve this problem?
a)
Vf = (a•t) + vi
b)
Vi = vf- (a•t)
c)
a = (vf-vi)/t
d)
t = (vf-vi)/a
26.
The equation for finding average acceleration is
a)
(final velocity - initial velocity)
÷ time
b)
(initial velocity - final velocity) 
∞ time
c)
initial velocity + final velocity + time
d)
initial velocity + final velocity - time
27.
A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?
a)
-7.5 m/s
b)
-7.5 m/s2
c)
-0.5 m/s2
d)
7.5 mi//hr
28.
Why does a car accelerate as it round a corner at a constant speed?
a)
Its direction changes
b)
It doesn't
c)
It slows down
d)
Its speeds up  
29.
The metric unit for acceleration is ______.
a)
m
b)
m/s
c)
m/s2
d)
s
30.
A golf ball rolls up a hill towards the hole. If the golf ball starts with a speed of 2 m/s and slows at a constant rate of 0.5 m/s2, what is its velocity after 2 s?
a)
0 m/s
b)
0.5 m/s
c)

3 m/s

d)
1.5 m/s
31.
Acceleration occurs when an object changes its speed or ______.
a)
direction
b)
force
c)
inertia
d)
mass
32.
Which runner stopped for a rest?
a)
Albert
b)
Bob
c)
Charlie
33.
How long did one of the runner's rest?
a)
8 seconds
b)
13 seconds
c)
5 seconds
d)
50 seconds
34.
Which runner won the race?
a)
Albert
b)
Bob
c)
Charlie
35.
Velocity is
a)
speed and acceleration
b)
constant speed
c)
a frame of reference
d)
speed in a given direction
36.
Acceleration is
a)
increasing speed
b)
decreasing speed
c)
changing direction
d)
all of the above
37.
A car driving at 50 miles per hour drives for 2 hours. What distance did it cover?
a)
50 miles
b)
25 miles
c)
100 miles
d)
75 miles
38.
What does this graph represent?
a)
Constant speed
b)
Acceleration
c)
Not moving
39.
What does this graph represent?
a)
Constant Speed
b)
Acceleration
c)
Not moving
40.
What does this graph represent?
a)
Constant speed
b)
Acceleration
c)
Not moving
41.
What is happening at E?
a)
Stationary
b)
Accelerating
c)
Fast steady speed; moving away from the starting position
d)
Steady speed; returning to start position
42.
Which runner had a head start?
a)
A
b)
B
c)
C
43.
 Every morning, Tom walks along a straight road from his home to the bus stop. Below, is a graph representing Tom’s trip to school.
- What is the distance covered through the second segment, which is between 50 seconds, and 70 seconds?
a)
40 meters
b)
60 meters
c)
80 meters
d)
20 meters
44.
Which graph shows the object standing still?
a)
A
b)
B
c)
C
d)
D
45.

What is this line of this graph showing?

a)

moving away from starting point at a constant speed

b)

moving back towards the starting point at a constant speed

c)

acceleration (getting faster)

d)

deceleration (getting slower)

46.

Billy runs 400 meters to Andy's house, turns around, and runs 400 meters back home. What is Billy's distance?

a)

0 meters

b)

400 meters

c)

800 meters

d)

1600 meters

47.

Billy runs 400 meters to Andy's house, turns around, and runs 400 meters back home. What is Billy's displacement?

a)

0 meters

b)

400 meters

c)

800 meters

d)

1600 meters

48.

Jerry walked from home to school, then from the school to the park. What is his total displacement?

a)

2 km

b)

5 km

c)

8 km

d)

10 km

49.

Jerry walked from home to school, then from the school to the park. What is his total distance?

a)

2 km

b)

5 km

c)

8 km

d)

10 km

50.

From the figure, what is the displacement?

a)

20 meters

b)

25 meters

c)

15 meters

d)

25 meters NE

51.

The change in an objects position from the final position to initial position.

a)

displacement

b)

distance

c)

motion

d)

reference point

52.

Two people walk across a parking lot. Their paths are shown in the image. Who traveled with a larger displacement?

a)

Person A

b)

Person B

c)

They both had the same displacement.

53.
David walks 3 km north, and then turns east and walks 4 km. What is the distance?
a)
7 km
b)
3 km
c)
4 km
d)
1 km
54.
Ronaldo runs across a soccer field, moving 10 meters north, then 8 meters west. His displacement would be:
a)
10.2 m, NW
b)
12.8 m, NW
c)
15.4 m, NW
d)
18.0 m, NW
55.
Because displacement has a magnitude and direction it is called a ______. 
a)
distance
b)
vector
c)
arrow
d)
length
56.
A person walks 50 meters directly north, stops, and then travels 32 meters directly south.  What is their displacement?
a)
82 meters
b)
18 meters
c)
28 meters
57.

Which of the following is correct?

a)

Initial Position = -5 m

Final Position = -5 m

Distance = 22 m

Displacement = 0 m

b)

Initial Position = -5 m

Final Position = -5 m

Distance = 0 m

Displacement = 22 m

c)

Initial Position = -5 m

Final Position = 6 m

Distance = 22 m

Displacement = 0 m

d)

Initial Position = -5 m

Final Position = 6 m

Distance = 0 m

Displacement = 22 m

58.

Which of the following is correct?

a)

Initial Position = -2 m

Final Position = 0 m

Distance = 14 m

Displacement = 2 m

b)

Initial Position = 0 m

Final Position = -2 m

Distance = 14 m

Displacement = -2 m

c)

Initial Position = -2 m

Final Position = 0 m

Distance = -2 m

Displacement = -2 m

d)

Initial Position = -2 m

Final Position = 0 m

Distance = 14 m

Displacement = 14 m

e)

None are correct.

59.

David walks 3 km north, and then turns east and walks 4 km. What is the displacement?

a)

1 km

b)

3 km

c)

4 km

d)

5 km

60.

What distance did the creature travel?

a)

23 m

b)

9 m

c)

-9 m

d)

-23 m

61.

What is the creature's final displacement?

a)

23 m

b)

9 m

c)

-9 m

d)

-23 m

62.
Object C had an initial position of 2 m and a final position of 10 m. The displacement of object C can be shown with this equation: Displacement = final position - initial position
What was the displacement of object C?
a)
+6 m
b)
+8 m
c)
-4 m
d)
-2 m
63.
Object B had an initial position of 12 m and a final position of 7 m. The displacement of object C can be shown with this equation: Displacement = final position - initial position
What was the displacement of object B?
a)
+5 m
b)
- 6 m
c)
-5 m
d)
+6 m
64.
What was the total distance traveled by object C?
a)
8 m
b)
10 m
c)
12 m
d)
14 m
65.

Which is the length of the path an object has traveled?

a)

displacement

b)

distance

c)

motion

d)

reference point

66.
A scalar is a magnitude _____.
a)
With direction.
b)
Without direction.
67.

What is a magnitude?

a)

A numeric value.

b)

A direction.

68.
Which statement describes a vector?
a)
It has magnitude but no direction
b)
It has direction but no magnitude
c)
It has both direction and magnitude
d)
It has constant magnitude but no
 direction
69.

Velocity is a

a)

Vector

b)

Scalar

70.

Distance is a

a)

Vector

b)

Scalar

71.

Displacement is a

a)

scalar

b)

vector

72.
A measurement of how fast an object is moving
a)
Velocity
b)
Speed
c)
Vector
d)
Acceleration
73.
What is velocity?
a)
the quickness of an object
b)
the location of an object
c)
acceleration
d)
speed in a specific direction
74.

Speed is

a)

Vector

b)

Scalar

75.

What is speed?

a)

It is how far you go

b)

It is the distance traveled over a period of time

c)

It is how fast you accelerate

d)

It is the change in the postilion of a object

76.
Is this a scalar quantity or a vector quantity?
A deer running 15 meters per second due west
a)
Scalar
b)
Vector
77.
Which of the following is a unit of time?
a)
sec
b)
mi
c)
m/s
d)
km
78.
What is the formula to calculate speed?
a)
Speed = time/distance
b)
Speed = distance/time
c)
Speed = distance x time
d)
Speed = time x distance
79.
Which of the following is a unit of speed ?
a)
sec
b)
mi
c)
m/s
d)
min
80.
Because displacement has a magnitude and direction it is called a ______. 
a)
distance
b)
vector
c)
arrow
d)
length
81.
After completing one trip on a roller coaster, the roller coaster's ________ is zero.
a)
displacement
b)
reference point
c)
length
d)
distance
82.
If the net force acting on any moving object is zero, the object will
a)
accelerate
b)
come to a stop
c)
continue in motion in a straight line
d)
move in a circular path
83.
Which of the following is an acceptable unit for mass? 
a)
pounds
b)
kilograms
c)
Newton’s 
d)
tons
84.
A box slides along a rough concrete surface and comes to a stop.  Which of the following best explains why the box comes to a stop?
a)
it is the natural tendency of an object in motion to come to a stop
b)
the concrete exerts a frictional force on the box that opposes its motion 
c)
there is no force pushing the box forward, so it stops
d)
the mass of the box causes it to slow down
85.
The Free Body Diagram above shows the forces acting on a hockey puck in motion to the right.  Which of the following describe the motion of the hockey puck?
a)
the hockey puck moves to the right with constant velocity
b)
the hockey puck is slowing down
c)
the hockey puck is speeding up
d)
the hockey puck moves is a circle
86.
A group of pirates fire a cannon.  They notice that when a cannon ball is fired from the cannon, the cannon rolls backwards.  The cannon is much more massive than the cannon-ball. 
Which of the following best explains why the cannon rolls backwards?
a)
the force that is exerted on the cannon ball is so great some is reflected back on   the cannon 
b)
 the inertia of the cannon causes it to roll backwards when the mass changes 
c)
the cannon ball’s energy is released to the cannon
d)
there is an equal force on the cannon but in the opposite direction of the force on the cannon-ball. 
87.
A group of pirates fire a cannon.  They notice that when a cannon ball is fired from the cannon, the cannon rolls backwards.  The cannon is much more massive than the cannon-ball. 
Compared to the acceleration of the cannon ball, the acceleration of the cannon is
a)
greater
b)
equal
c)
less than
d)
cannot be determined
88.
A 400 N girl standing on a dock exerts a force of 100 N on a 10,000 N sailboat as she pushes it away from the dock. How much force does the sailboat exert on the girl?  
a)
25 N 
b)
100 N 
c)
 400 N
d)
10,000 N
89.
A group of students are pulling a bucket of mass 10.0 kg from the bottom of the well by tying a rope to the bucket and pulling upwards. Use g = 10 m/s2 to simplify calculations.
What is the weight of the bucket?
a)
0
b)
10
c)
100
d)
200
90.
A group of students are pulling a bucket of mass 10.0 kg from the bottom of the well by tying a rope to the bucket and pulling upwards at a constant velocity
What is the free body diagram for this situation? 
a)
A
b)
B
c)
C
d)
D
91.
A group of students are pulling a bucket of mass 10.0 kg from the bottom of the well by tying a rope to the bucket and pulling upwards.  Use g = 10 m/s2 to simplify calculations.
How much upward force must the students exert to raise the bucket at a constant velocity?
a)
0 N
b)
100 N
c)
120 N
d)
200 N
92.
A group of students are pulling a bucket of mass 10.0 kg from the bottom of the well by tying a rope to the bucket and pulling upwards.  Use g = 10 m/s2 to simplify calculations.
What is the net force on the bucket when the students apply 200.0 N of upward force?    
a)
0 N
b)
 90 N
c)
100 N
d)
200 N
93.
An object is moved upwards according to the position vs. time graph shown. Upwards is considered to be the positive y direction.
Which of the following Free Body Diagrams could show the forces acting on the object at t = 2 s?
a)
A
b)
B
c)
C
d)
D
94.

These two individuals are pushing a 5500 kg car with a horizontal force of 300 N. What is the Normal Force of the car?

a)

53,900 N

b)

300 N

c)

2940 N

d)

30.6 N

95.

Two students that are afraid of the Tardy Terminator are late to class.  They decide to take the elevator even though they are not allow.  Their mass is 40 kg each and the mass of the elevator is 220 kg.  Assume the elevator accelerates upward at 2.00 m/s².  What is the net force that acts on the elevator?

a)

300 N

b)

160 N

c)

2 N

d)

600 N

96.

A net force is acting on a 10 kg box produces an accelerate of 3.0 m/s².  What acceleration, to the nearest tenth, will the same net force cause on a 4 kg box? Only type the number.

(a)  

97.

This 75 kg bridge jumper leaped off a 20 m high bridge. Knowing Earth's gravity is acting on him, which statement best represents the reaction force to Earth's gravity?

a)

Earth is pulling on air with a force of 4.11 x10^4 N.

b)

Earth is pulling on water with a force of 3.66 x 10^12 N.

c)

The sun is pulling on Earth with a force of 5.97 x 10^24 N.

d)

The jumper is pulling on Earth with a force of 735 N.

98.

A net force acting on a 5 kg desk produces an acceleration of 5 m/s^2. What mass, to the nearest tenth, will the same net force cause on a desk accelerating at 12.5 m/s^2. Only type in a number.

(a)  

99.

This guy, who may or may not be Spiderman, jumps off a building to stop Green Goblin. His mass is 55 kg. Superheroes are subject to Earth's gravity. Which statement best describes the reaction force to Earth's gravity in this situation?

a)

Earth is pulling on the sun with a force of 5.97 x 10^24 N.

b)

Earth is pulling on Spiderman wannabe with a force of 539 N.

c)

Earth is pulling on air with a force of 5.61 x10^ 5 N.

d)

Earth is pulling on Green Goblin with a force of 4.99 x 10^7 N.

100.

These two chaps are moving this 200 kg box with a horizontal force of 600 N. What is the magnitude of the Normal Force?

a)

5880 N

b)

600 N

c)

1960 N

d)

61 N

101.

What is the amount of force needed to accelerate a 2 kg object at 10 m/s^2? Type only a number

(a)  

102.

A vendor and his hot dog cart are in an elevator at AT&T Stadium.  The vendor has a mass of 50 kg and his cart is 20 kg, hot dogs included.  The elevator has a mass of 300 kg.  The elevator accelerates upwards at 1 m/s².  What is the upward force acting on the elevator?

a)

70 N

b)

370 N

c)

300 N

d)

9.8 N

103.

What is the amount of force required to accelerate a 10 kg object at 20 m/s^2? Only type a number.

(a)  

104.

A soccer ball is sitting in the middle of a field. The ball will remain at rest until an outside force like a players foot or the wind acts upon it. Which of Newton's laws is represented by this?

a)

1st

b)

2nd

c)

3rd

105.

Think about pushing a shopping cart and a car. If you apply the same amount of force to both, the shopping cart will travel fast, but the car will hardly move. To move the car yo would need a larger force. Which of Newton's laws is being represented?

a)

1st

b)

2nd

c)

3rd

106.

Sally jumps on her trampoline. She exerts a force on the trampoline and the trampoline exerts an equal but opposite force back on Sally. This represents

a)

Law 1

b)

Law 3

c)

Law 2

107.

What Newtons law does this picture represent

a)

Newtons 1st law

b)

Newtons 2nd law

c)

Newtons 3rdt law

d)

Newtons 4rth law

108.

Which law explains that it would take more force to push the car than the lawnmower?

a)

1st

b)

2nd

c)

3rd

109.

There is a skateboard rolling and then Billy steps on it and it stops. What Law of motion is this?

a)

3rd

b)

2nd

c)

1st

110.

When you are running. your foot exerts force on the ground and the ground exerts force back onto you. Which of Newton's laws is represented

a)

1st

b)

2nd

c)

3rd

111.

If we put the same force on a bowling ball and a soccer ball, the soccer ball will move faster! Which law explains this?

a)

1st

b)

2nd

c)

3rd

112.

Which way would a swimmer push to move forward in the water?

a)

To the left

b)

Forward

c)

Backward

113.

The reason a ball bounces up when it hits the ground:

a)

The ball and ground repel each other.

b)

The ball exerts a force on the ground, and the ground exerts a force on the ball.

114.

Observe what happens to the motion of the penny. Which of Newton's Laws does this represent?

a)

Newton's 1st Law, inertia

b)

Newton's 2nd Law, Force = m x a

c)

Newton's 3rd Law, action/reaction

115.

Watch as Blake pushes the 2 cars of different masses with about the same force. Observe what happens. Which of Newton's Laws does this represent?

a)

Newton's 1st Law, inertia

b)

Newton's 2nd Law, Force = m x a

c)

Newton's 3rd Law, action/reaction

116.

Watch as I propel the washers across the desk. Observe what happens as I use different amounts of force.

a)

Newton's 1st Law, inertia

b)

Newton's 2nd Law, Force = m x a

c)

Newton's 3rd Law, action/reaction

117.

Watch as I send the car down the track. What happens as I increase the force that I am using? Which of Newton's Laws does this represent?

a)

Newton's 1st Law, inertia

b)

Newton's 2nd Law, Force = m x a

c)

Newton's 3rd Law, action/reaction

118.

Watch as Blake begins to run. What happens to the sheets of paper under his feet? Why? Which of Newton's Laws does this represent?

a)

Newton's 1st Law, inertia

b)

Newton's 2nd Law, Force = m x a

c)

Newton's 3rd Law, action/reaction

119.

Observe the motion of the washer as I quickly pull the card out from under it. What happened to the washer? Why? Which of Newton's Laws does this represent?

a)

Newton's 1st Law, inertia

b)

Newton's 2nd Law, Force = m x a

c)

Newton's 3rd Law, action/reaction

120.

Which of Newton’s Laws explains a rocket’s movement during launch?

a)

Newton's First Law of Motion

b)

Newton's Second Law of Motion

c)

Newton's Third Law of Motion

d)

Newton's Fourth Law of Motion

121.

When a student runs and kicks a ball, they have applied an ___________ force to move the ball.

a)

Balanced

b)

Magnetic

c)

Spring

d)

Unbalanced

122.

What Unit do we Measure Force in?

a)

Newtons

b)

Joules

c)

Force

d)

Kilograms

123.

Newton's third law states that any action will have a(n) _______ and ______ reaction

a)

Equal and similar

b)

Equal and opposite

c)

Equal and different

d)

Greater and opposite

124.
The momentum of an object depends upon the object's ___________&_____________.  
a)
size and shape
b)
mass and speed
c)
mass and veloctiy
d)
mass and energy
125.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
126.
Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
a)
car
b)
bike
c)
they are equal
d)
cannot determine using the info provided
127.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
128.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
129.
When two objects collide, the Pbefore is ____________ the Pafter.
a)
more than 
b)
less than 
c)
equal to
d)
unrelated to
130.
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
131.
What is the unit for momentum?
a)
m/sec
b)
kg/sec
c)
kg/m
d)
kg m/sec
132.
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
133.
A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision.  What is the velocity of the second ball after the collision? 
a)
5 m/s
b)
2.5 m/s
c)
10 m/s
d)
7.5 m/s
134.
A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. At what speed will the second boxcar move?
a)
18.6 m/s
b)
9.3 m/s
c)
7.5 m/s
d)
1.86 m/s
135.
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.
136.
Determine the momentum of 1000-kg car moving northward at 20 m/s......... 
a)
20000 N
b)
20000 Joules
c)
20000 Kg * m/s
d)
20000 kg * m/s north
137.
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
138.
A person on a stationary skateboard throws a bowling ball with a velocity of 5.0 m/s. What is a possible speed of the person after the throw? 
a)
0 m/s
b)
1.5 m/s
c)
5.0  m/s
d)
7.5 m/s
139.
Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:
a)
2 m/s 
b)
3.4 m/s 
c)
4.6 m/s 
d)
7.1 m/s
140.
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
141.
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.
142.

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?

a)

45 kg m/s

b)

72 kg m/s

c)

32.4 kg m/s

d)

0.45 kg m/s

143.
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.
a)
0.5 m/s
b)
1.0 m/s
c)
0.33 m/s
d)
0.67 m/s
144.
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?
a)
2 m/s
b)
8 m/s
c)
-2 m/s
d)
1.5 m/s

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