The Earth exerts a gravitational force on the Moon. What is the force-pair to this interaction?

The Moon exerts a gravitational force on the Earth.

Which is NOT true about the object in the FBD shown below?

It is accelerating to the right.

The force of a planet's gravity on an object

The road exerts an upward force on a car. What is the force-pair to this interaction?

The car exerts a downward force on the road.

An 18-wheeler crashes into a Prius in a head-on collision. Which experiences more force?

They both experience the same amount of force

If you throw an object in empty outer space, will it ever stop moving?

No because an object in motion stays in motion

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Unit 2 Review

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A review of the second unit of high school physics (includes forces and Newton's Laws).

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Questions 21

Answers

1
What is the sum-of-forces statement for this FBD in the y-direction?
Fnet,y= -FF + FN - Fg + Fapp
Fnet,y= -FF + Fapp
Fnet,y= FN + Fg
Fnet,y= FN - Fg
2
If an object travels with constant velocity, what is its acceleration?
Positive constant
Positive and increasing
Zero
Negative and increasing
3
If you throw an object in outer space, you will float backward. Which law explains why?
Newton's First Law
Newton's Second Law
Murphy's Law
Newton's Third Law
4
The Earth exerts a gravitational force on the Moon. What is the force-pair to this interaction?
The Moon exerts an applied force on the Earth.
The Earth exerts an applied force on the Moon.
The Earth exerts a gravitational force on the Moon.
The Moon exerts a gravitational force on the Earth.
5
An 40 kg object experiences a net force of 20 N. What is its acceleration?
20 m/s2
800 m/s2
2 m/s2
0.5 m/s2
6
Which is NOT true about the object in the FBD shown below?
It is accelerating to the right.
It is supported by a surface.
It has constant velocity.
It is moving to the right.
7
When an object is in equilibrium, all its forces are balanced. This DEFINITELY means that...
The horizontal forces are equal to the vertical forces.
The object is at rest.
The object is moving with constant velocity.
The acceleration is zero.
8
If the net force acting on an object is tripled, the acceleration...
stays the same
triples
doubles
is cut by one-third
9
What is weight?
How much space something takes up
The force of a planet's gravity on an object
The same as mass
How much matter/particles are in an object
10
What is the sum-of-forces statement for this FBD in the x-direction?
Fnet,x= FF
Fnet,x= -FF + FN -Fg
Fnet,x= -FF
Fnet,x= FF + FN + Fg
11
An object has m = 4 kg and a = 3 m/s². What is F_net?
12 N
12 m/s2
12 J
12 m
12
If the net force is held constant but the mass doubles, the acceleration...
doubles
is cut in half
stays the same
triples
13
Which is NOT true about the object in the FBD shown below?
It is accelerating to the left.
It is moving to the left.
It is experiencing a frictional force.
It is slowing down.
14
The road exerts an upward force on a car. What is the force-pair to this interaction?
The car exerts a downward force on the road.
The road exerts a normal force on the car.
The car exerts an upward force on the road.
The car exerts a normal force on the road.
15
Net/unbalanced forces make objects...
increase their inertia
stay in motion
accelerate
move
16
What equation do you use to find weight?
Fg = -9.8
Fg = mag
W = -9.8
W = ma
17
When an object is in equilibrium, all its forces are balanced. This means that...
There are definitely no forces acting on the object.
The object is accelerating.
The object's velocity is changing.
The net force is zero.
18
An 18-wheeler crashes into a Prius in a head-on collision. Which experiences more force?
The Prius
Neither experiences any force
The 18-wheeler
They both experience the same amount of force
19
If you throw an object in empty outer space, will it ever stop moving?
No because an object in motion stays in motion
No because there is a net force acting on the object
Yes because it will "run out" of force
Yes because all objects naturally slow down over time
20
An 18-wheeler crashes into a Prius in a head-on collision. Which experiences more acceleration?
They both experience the same amount of acceleration
The 18-wheeler
The Prius
Neither experiences any acceleration
21
Which law explains why crashing your car sends you flying through the windshield?
Newton's Third Law
Murphy's Law
Newton's First Law
Newton's Second Law

Unit 2 Review Flashcards | StudBud