Question 1

What causes some objects to fall slower than others?

Accepted Answer

air resistance

Answer

forces

Answer

gravity

Answer

acceleration

Question 2

When a falling object reaches terminal velocity, the force of gravity __________ the force of air resistance.

Accepted Answer

equals

Answer

is unrelated to

Answer

is less than

Answer

is greater than

Question 3

In which direction is centripetal force?

Accepted Answer

toward the center of a circle

Answer

along the curve

Answer

upward

Answer

toward the edges of a circle

Question 4

What happens to the weight of astronauts when they are in orbit?

Accepted Answer

it becomes zero

Answer

it increases

Answer

it does not change

Answer

it decreases but does not become zero

Question 5

__________ measures an object's tendency to resist changing its motion.

Accepted Answer

inertia

Answer

mass

Answer

weight

Answer

gravity

Question 6

Newton's first law of motion states that __________.

Accepted Answer

an object will remain at rest or keep moving unless a force acts on it

Answer

when a force is applied on an object, there is an equal force applied by the object in the opposite direction

Answer

when a force acts on an object, its acceleration is in the same direction as the force

Answer

acceleration is calculated by dividing the force exerted on an object by the mass of the object

Question 7

When force is increased, what happens to acceleration?

Accepted Answer

It increases.

Answer

It fluctuates.

Answer

It stays the same.

Answer

It decreases.

Question 8

Newton's second law of motion is __________.

Accepted Answer

F = m xa

Answer

F= m/a

Answer

p = m/v

Answer

p = m × v

Question 9

Newton's third law of motion states that __________.

Accepted Answer

for every action force there is an equal and opposite reaction force

Answer

an object at rest tends to stay at rest

Answer

an object in motion tends to stay in motion

Answer

force is equal to mass times acceleration

Question 10

A(n) __________ is a push or a pull that one body exerts on another.

Accepted Answer

force

Answer

velocity

Answer

acceleration

Answer

motion

Question 11

The __________ is the combination of all the forces acting on an object.

Accepted Answer

net force

Answer

inertia

Answer

force pair

Answer

direction of motion

Question 12

Forces that cancel each other are called __________ forces.

Accepted Answer

balanced

Answer

unbalanced

Answer

neutral

Answer

inactivated

Question 13

Which best demonstrates friction?

Accepted Answer

a car rolling to a stop at a traffic light

Answer

an ice-skater sliding across the ice without noticeably slowing down

Answer

the free fall of astronauts in orbit

Answer

a baseball moving in a projectile motion

Question 14

A snow skier slowing to a stop after skiing down a mountain demonstrates __________ friction.

Accepted Answer

sliding

Answer

air

Answer

rolling

Answer

static

Question 15

The gravitational force exerted on an object is called the object’s ______.

Accepted Answer

weight

Answer

acceleration

Answer

velocity

Answer

mass

Question 16

What happens to the gravitational force as objects get closer?

Accepted Answer

increases

Answer

remains the same

Answer

no way to tell

Answer

decreases

Question 17

Forces can be:

Accepted Answer

pushes and pulls

Answer

none of the above

Answer

pushes only

Answer

pulls only

Question 18

What is the unit of force called?

Accepted Answer

newton, N

Answer

newton, kg

Answer

neutron, N

Answer

pascal, N

Question 19

Why does an astronaut weigh less on the Moon than on the Earth?

Accepted Answer

the force of gravity is weaker on the surface of the Moon than on the surface of the Earth.

Answer

the Moon has no atmosphere.

Answer

he has more mass on the moon than on Earth.

Answer

the Moon has no gravity.

Question 20

What is the weight of a 20 kg box on the Earth?

Accepted Answer

196 N

Answer

196 m/s^2

Answer

196 kg

Answer

2.04 N

Question 21

The weight of a 100 N laser printer accelerates at 0.5 m/s². What is the mass of the laser printer?

Accepted Answer

200 kg

Answer

200 N

Answer

50 kg

Answer

50 N

Question 22

What can we say about the forces on an object that is not moving?

Accepted Answer

the forces must be balanced

Answer

the forces must be unbalanced

Answer

there must only be one force acting on it

Answer

object  must be very heavy

Question 23

You just collected a huge bag of leaves in your yard, and you need to move it out to 
the curb.  How could you get the bag to move faster?

Accepted Answer

both pushing harder and making it lighter would work

Answer

none of the above

Answer

use more force (push harder)

Answer

take some leaves out to make it weigh less (make it lighter)

Question 24

Which of the following is an example of increasing friction intentionally?

Accepted Answer

throwing sand on an icy driveway

Answer

adding grease to gears on a bike

Answer

adding WD40 to a squeaky door

Answer

waxing skis

Question 25

If you are launching a matchstick rocket, the action force is the rocket pushing the gases down.  What is the reaction force?

Accepted Answer

The gases pushing the rocket up.

Answer

The gases pushing the rocket down.

Answer

The table pushing the rocket up.

Answer

The table pushing the rocket down.

Question 26

A net force accelerates a 10 kg mass with an acceleration 4 m/s². If the same net force is applied to 20 kg mass, then the acceleration will be

Accepted Answer

2 m/s2

Answer

8 m/s2

Answer

4 m/s2

Answer

1 m/s2

Question 27

What is the acceleration due to gravity on a planet where a 40 kg box weighs 100 N?

Accepted Answer

2.5 m/s2

Answer

.04 m/s2

Answer

4000 m/s2

Answer

More information needed.

Question 28

What are the units of momentum?

Accepted Answer

kg m/s

Answer

kgms

Answer

kg m/s^2

Answer

N

Question 29

How much force is needed to accelerate a 66 kg skier at 2 m/s²?

Accepted Answer

132 N

Answer

.03 N

Answer

132 kg

Answer

33 N

Question 30

What is the acceleration of a 50 kg object pushed with a force of 500 N?

Accepted Answer

10 m/s2

Answer

10 m/s

Answer

.1 m/s2

Answer

10 N

Question 31

A force of 250 N is applied to an object that accelerates at a rate of 5 m/s². What is the mass of the object?

Accepted Answer

50 kg

Answer

50 N

Answer

.1 kg

Answer

1,250 kg

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