Question 1

A force

Accepted Answer

is a push or pull that can change the motion of an object

Answer

is a push or pull that can only act when objects are in contact with each other

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is a push or pull that always results in at least one object moving

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is a push or pull that can only act from a distance

Question 2

A contact force

Accepted Answer

acts between two objects that are touching one another

Answer

can only move one of two objects touching each other

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must move both of two objects touching each other

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acts indirectly on both objects in the pair

Question 3

Motion

Accepted Answer

is the change in an object's position with respect to time and in comparison to the position of other objects used as references

Answer

is the change in an object's position over time only when a contact force is applied

Answer

is caused only by contact forces

Answer

is caused only by at-a-distance forces

Question 4

Sir Isaac Newton wrote

Accepted Answer

three laws of motion

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four laws of motion

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four laws of gravity

Answer

three laws of gravity

Question 5

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 remains at rest and an object in motion continues to move at a constant velocity unless acted upon by an external force

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forces in nature are found as either contact or at-a-distance forces

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acceleration is directly proportional to force and inversely proportional to mass

Question 6

Equal and opposite forces do not result in equal motion because

Accepted Answer

the masses of the objects may be different

Answer

any of these answers may be correct in a given instance

Answer

the size of the objects may be different

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the weight of the objects may be different

Question 7

Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it. What is the formula for calculating force?

Accepted Answer

F = ma [force = mass X  acceleration]

Answer

F = wa [force = work X acceleration]

Answer

F = ma [force = mass X action]

Answer

F = wa [force = weX acceleration]

Question 8

In action/reaction forces, how are pairs labeled?

Accepted Answer

Since these forces happen at the same time, either force can be labeled as action and either force can be labeled as reaction

Answer

The force that results in the greatest motion is labeled action and the other is labeled reaction

Answer

The force that starts the process is labeled action and the force that is acted on by that force is labeled reaction

Answer

Since these forces happen at different times, but are equal, it is not important how they are labeled

Question 9

Which one of the following would be an example of a contact force?

Accepted Answer

a basketball sitting on the gym floor

Answer

lightning about to strike the Earth

Answer

a ping pong ball falling to the floor

Answer

a metal ball being attracted by a magnet

Question 10

A force that acts at a distance would NOT be

Accepted Answer

frictional

Answer

magnetic

Answer

gravitational

Answer

electrical

Question 11

Action-reaction forces cannot occur

Accepted Answer

when objects do not touch or are not attracted or repelled by an action-at-a-distance force

Answer

when objects are not touching one another

Answer

when objects are touching one another

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when objects are made of different types of matter

Question 12

Action-at-a-distance forces do NOT include

Accepted Answer

wind

Answer

electricity

Answer

gravity

Answer

magnetism

Question 13

Action-at-a-distance forces do not result in

Accepted Answer

forces that are one dimensional

Answer

forces that are opposite in direction

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forces that are equal in magnitude

Answer

action-reaction forces

Question 14

The motion that a gravitational force produces is dependent on

Accepted Answer

the mass of the objects

Answer

the volume of the objects

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the weight of the objects

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the speed of the objects

Question 15

Which statement is NOT true about the relationship between the Moon and the Earth?

Accepted Answer

Because of its size, the Moon's mass is able to influence the motion of the Earth

Answer

the Moon exerts gravitational pull on the Earth

Answer

the motion of the orbit is determined by the differences in mass of the Earth and the Moon

Answer

Earth exerts gravitational pull on the Moon

Question 16

Which is NOT true about magnetic forces?

Accepted Answer

they exert forces only when they are in contact with particles

Answer

they can attract particles

Answer

they can repel particles

Answer

they can exert action from paired forces at a distance

Question 17

Unbalanced forces do NOT cause

Accepted Answer

cause a change in mass

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a change in direction

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a change in acceleration

Answer

a change in motion

Question 18

When all the forces on an object are balanced

Accepted Answer

all of these answers are correct

Answer

the net force is zero

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no acceleration will occur

Answer

the object will either stay at rest or continue at its current state of motion

Question 19

When the forces acting on a plane flying at 200m/s west are balanced what cannot be true?

Accepted Answer

it could gain altitude to avoid thick cloud cover

Answer

it cannot speed up

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it cannot change directions

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it cannot slow down

Question 20

A rocket being launched at Cape Canaveral accelerates because

Accepted Answer

hot gasses are expelled backward at a high velocity

Answer

of balanced forces

Answer

of gravity

Answer

hot gasses being pushed out of the bottom of the rocket push on the launch pad and the air

Question 21

Mass

Accepted Answer

stays the same for an object no matter what environment the object is in

Answer

is determined by the volume of an object

Answer

changes with changes in gravitational force

Answer

is another term for weight

Question 22

Weight

Accepted Answer

is a measure of the amount of gravitational pull that is being exerted on an object

Answer

is always the same as mass

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is a measure of the amount of matter in an object

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remains the same in any environment

Question 23

Density is NOT

Accepted Answer

a measure of weight

Answer

calculated by the formula p = m/v where pis volume, m is mass and v is volume

Answer

a measure of how tightly packed the molecules are in an object

Answer

a measurement of how much mass there is in a given volume of matter

Question 24

The best definition for the term force is

Accepted Answer

a push or a pull that can change the motion of an object

Answer

the push or pull that is generated by gravity

Answer

a push or a pull that can only act as objects are in contact with one another

Answer

a push or a pull  that must act at a distance

Question 25

Velocity is

Accepted Answer

a measure of both the speed and direction of an object

Answer

a measure of acceleration

Answer

a measure of gravitational pul;l on an object

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a measure of the speed of an object

Question 26

Newton's third law of motion states that every action has an equal and opposite reaction. This means that

Accepted Answer

all of these answers are correct

Answer

Action and reaction forces are equal and opposite, but they are not balanced forces

Answer

forces always act in pairs

Answer

The acting forces are not balance because they are acting on different objects with different masses

Question 27

The best definition for the term unbalanced force is

Accepted Answer

a force that changes the position, speed or direction of the object to which it is applied

Answer

a force that is able to change the mass of an object

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a force that can change direction

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an unstable force

Question 28

Balanced forces

Accepted Answer

are two forces acting in opposite directions on an object that are equal in size

Answer

are only balanced when acting on objects with equal mass

Answer

produce acceleration

Answer

show that the objects they are acting upon are of equal weight

Question 29

A distance force

Accepted Answer

is a type of force that results even when the two interacting objects are not in physical contact with each other

Answer

can only exert a push on an object

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can act on an object only if that object is moving

Answer

can only exert a pull on an object

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