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Net Force/Friction/Newton's 3rd Law/Momentum Review

Total questions: 75

Worksheet time: 47mins

Name
Class
Date
1.
A force acting in the opposite direction of an object in motion
a)
Gravity
b)
Buoyant
c)
Friction
d)
Normal
2.
What is the net force in this diagram?
a)
8N right
b)
2 N right
c)
8N left
d)
2N left
3.
What is the net force of an object that is not moving?
a)
0N
b)
100N
c)
Upward force
4.
Why does a book on a table not move?
a)
No forces are acting on the book
b)
Gravity is the only force acting on the book
c)
Forces of the table pushing up and gravity pulling down are balanced
5.
Find the net force
a)
0N
b)
50N
c)
50N to the left
d)
50N to the right
6.
True or false: You can't exert a force on anything unless it also exerts a force on you.
a)
True
b)
False
7.
What causes a rocket to lift off and accelerate?
a)
The rocket is propelled by the impact of exhaust gases against the atmosphere.
b)
The rocket is propelled by the recoil from the ejected gas.
c)
Magic
8.
Newton's third law is the law of __________________.
a)
action and reaction
b)
inertia
c)
acceleration
d)
science rocks
9.
Which best explains why we are able to accelerate forward when starting to run?
a)
As one leg moves backward, it provides an equal and opposite force for the other foot to move forward.
b)
No acceleration takes place. Runners are always at a fixed velocity.
c)
The striking foot pushes backward against the ground. The friction with the ground provides an equal and opposite force forward.
d)
The runner's upper body quickly leans forward, causing the entire body to begin accelerating forward
10.
When a large truck pushes a small car with a given force, the small car is applying an equal and opposite force on the truck.
a)
True
b)
False
11.
With unbalanced forces, the object will move in the direction that the _______ force is being applied.
a)
larger 
b)
smaller 
c)
equal 
12.
You push on a tree with 20 N of force. If the tree doesn't move, the tree is pushing back on you with _____of force.
a)
20N 
b)
40N 
c)
10N 
d)
70N
13.
Relating to Newton’s Third Law, action and reaction, what is the reaction when a rocket expels gas, smoke and flames from the nozzle end of the rocket engine?
a)
Nothing
b)
Propels in the opposite direction
c)
Creates a balanced force
d)
Creates friction
14.
A sled slides down a hill, reaches the level surface and eventually  comes to a stop.  The fact that the sled ultimately stops is best explained by _?__
a)
An unbalanced force would be required to keep the sled moving forward at constant speed
b)
The presence of an unbalanced force (e.g. friction) can cause a moving object to stop
c)
The presence of inertia causes it to stop
d)
The natural tendency of any object is to ultimately stop
15.
______is a force that resists motion between two surfaces that are in contact.
a)
Inertia
b)
Friction
c)
acceleration
d)
resistance
16.

If the net force is equal to zero, the forces acting on the object are

a)

balanced

b)

unbalanced

17.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
18.
A type of friction that occurs when air pushes against a moving object causing it to decelerate.
a)
surface area
b)
air resistance
c)
velocity
d)
gravity 
19.
What type of friction is not moving?
a)
static
b)
sliding
c)
fluid
d)
rolling
20.
Which would NOT be a way of reducing friction?
a)
making the surfaces smoother
b)
using lubricants such as waxes, oils, or grease
c)
changing from sliding friction to rolling friction using ball bearings
d)
Using kitty litter on snow and ice to help your car gain traction
21.
Wheels on a skateboard most likely experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
22.
Sally experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
23.
Objects balanced on Timmy's head experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
24.
Rougher surfaces have ...
a)
greater friction
b)
less friction
c)
the same level of friction
25.
To calculate net force, when forces are acting in opposite directions, the forces are ...
a)
added 
b)
subtracted 
c)
multiplied 
d)
divided 
26.
How many types of frictions are there?
a)
2
b)
4
c)
10
d)
6
27.
What is Sliding Friction?
a)
Opposes submarines in the water and airplanes in the air
b)
Opposes the dirrection of an 0bject as it slides over a surface
c)
None of the above
d)
Change in shape the point of rolling contrast because of friction
28.
Define Fluid Friction
a)
Friction that occurs when a solid pushes a liquid or a gas aside
b)
The friction of stationary objects. You must use more force to move an object experiencing this kind of friction
c)
Friction that occurs when a solid rolls across a surface
d)
Friction caused by two objects sliding against each other
29.
Define Rolling Friction
a)
Friction caused by two objects sliding against each other
b)
Friction that occurs when a solid rolls across a surface
c)
Friction that occurs when a solid pushes a liquid aside
d)
The friction of stationary objects. You must use more force to move an object experiencing this kind of friction
30.
Define Static Friction
a)
Friction caused by two objects sliding against each other
b)
Friction that occurs when a solid rolls across a surface
c)
The friction of stationary objects. You must use more force to move an object experiencing this kind of friction
d)
Friction that occurs when a solid pushes a liquid aside
31.
Jimmy puts his fist in a glass of water. The friction applied to his fist is a
a)
Fluid Friction
b)
Sliding Friction
c)
Rolling Friction
d)
Static Friction
32.
You are pushing a refrigerator with a force of 300N. Friction is acting against you with a force of 200N. What is the net force?
a)
500N
b)
600N
c)
1.5N
d)
100N
33.
You and your friend, are playing tug of war. Your friend pulls with a force of 55 N, to the right. You pull with a force of 65 N, to the left. What is the net force on the rope?
a)
10 n, to the left
b)
20 N
c)
10 N, to the left
d)
10 N, to the right
34.
True or False: The direction of force can only go right or left.
a)
True
b)
False
35.
Swimming fish experience-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
36.
Which type of friction occurs when an object moves through a liquid or gas?
a)
sliding
b)
fluid
c)
static
d)
rolling
37.
Friction acts in a direction ___________ to the object's direction of motion.
a)
similar
b)
opposite
c)
parallel
d)
west
38.
Which type of friction occurs when objects are not moving?
a)
static
b)
sliding
c)
fluid
d)
rolling
39.
What is the net force?
a)
5000 N right
b)
4000 N right
c)
40 N left
d)
4000 N left
40.
__________ is the sum of all forces acting on an object. 
a)
velocity
b)
gravity
c)
net force
d)
distance
41.
This baseball player experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
42.
Wheels of a shopping cart experience-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
43.
Objects balanced on Timmy's head experience-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
44.
Wheels on a skateboard most likely experience-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
45.
Which type of friction occurs when solid surfaces slide over each other?
a)
rolling
b)
static
c)
sliding
d)
fluid
46.
Oil between machine parts would be an example of which type of friction?
a)
static
b)
sliding
c)
fluid
d)
rolling
47.
If the net force is 0, the object is... 
a)
moving
b)
not moving
c)
changing direction 
48.
You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N to the right. What is the net force on the couch?
a)
60 N right
b)
10 N left
c)
60 N left
d)
50 N right
49.
Why is person B having a hard time moving down the hill?
a)
Person B has more friction than person A.
b)
Person B has the same friction as person A.
c)
Person B is out of shape.
d)
Person B has less friction has person A.
50.
This is an example of what kind of force?
a)
Balanced Force
b)
Pushing Force
c)
Gravity Force
d)
Unbalanced Force
51.
A force that slows or stops motion when objects rub together.
a)
Friction
b)
Push
c)
Pull
d)
Magnetism
52.
If an object is stationary (not moving) the forces acting upon it are _____________
a)
unbalanced
b)
weak
c)
balanced
d)
Hulk Smash!
53.
If two forces act on an object in the same direction, the net force is the _____________
a)
the difference between the two forces
b)
the sum of the two forces
c)
Only one of the forces acts on the object
d)
DOOMSDAY!
54.

Newtons law states that for every action, there is an_________ reaction

a)

unequal and opposite

b)

stronger and opposite

c)

equal and similar

d)

equal and opposite

55.

Force always come in________

a)

waves

b)

triplets

c)

pairs

56.

When a heavy football player and a light one run into each other, who exerts more force

a)

The light one

b)

Their force are equal

c)

The heavy one

57.

When a small car pushes a big truck, the truck applies an equal and opposite force on the car.

a)

False

b)

True

58.

You can't exert a force on anything unless it also exert a force on you

a)

False

b)

True

59.

The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is this arrangement necessary for a rocket to function properly?

a)

The rocket is protected from the heat of the exhaust.

b)

Burned fuel can be collected on the ground.

c)

As fuel is combusted, the rocket pushes the gases backward and the gases push the rocket forward.

d)

This allows the rocket to be steered properly.

60.

Action reaction forces never cancel each other out because

a)

They act on different objects.

b)

They act on the same objects

c)

They do not act on objects.

61.

When the person pushes the ground with their foot, the equal and opposite reaction force is

a)

the ground pushing back on their foot

b)

when they start to move forward

62.

Force always come in________

a)

waves

b)

triplets

c)

pairs

63.
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
64.
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
65.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
66.
The total momentum before a collision is _________ the total momentum after a collision.
a)
equal to 
b)
less than 
c)
more than
d)
It depends on the type of collision
67.

If a momentum car is moving at 2 kg m/s and crashes into a stationary momentum car, how much momentum would transfer over to the stationary car?

a)

all of the momentum

b)

half of the momentum

c)

a little bit of the momentum

d)

zero momentum

68.

Determine the momentum of 1000-kg car moving northward at 20 m/s.........

a)

20,000 N

b)

20,000 Joules

c)

20,000 Kg * m/s

d)

20,000 kg * m/s north

69.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
70.

Which of the following statements describes momentum?

a)

the product of body’s mass and velocity

b)

the product of body’s mass and acceleration

c)

the sum of body’s mass and velocity

d)

the sum of body’s mass and acceleration

71.

What is the unit for momentum?

a)

kgm/s

b)

kgm/s2

c)

Nkg

d)

Nm/s

72.

The total momentum of two objects before a collision is 450 kgm/s. What will their total momentum be after the collision?

a)

0 kgm/s

b)

175 kgm/s

c)

350 kgm/s

d)

450 kgm/s

73.

What is the formula to calculate momentum?

a)

Momentum = Mass x Velocity

b)

Momentum = Mass / Velocity

74.

The rule that in the absence of outside forces the total momentum of objects that interact does not change is called

a)

The law of conserving momentum

b)

The law of the conservation of momentum

75.

The total momentum of any group of objects _________________ unless outside forces act on the objects.

a)

changes

b)

remains the same

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