Quiz about Grade 8 Forces and Motion

Question 1

Which of the following best describes a force?

Accepted Answer

A push or pull that changes the speed or direction of an object

Answer

The tendency of an object to resist a change in its motion

Answer

Measure of an object's inertia

Answer

Direction and distance from a start point to an end point

Question 2

Speed is determined based on two factors. What are they?

Accepted Answer

Distance and time

Answer

Distance and displacement

Answer

Inertia and distance

Answer

Inertia and displacement

Question 3

Sarah and Joy are pushing against a block in opposite directions. Sarah is pushing to the right with a force of 10N and Joy is pushing to the left with a force of 12N Which is an accurate statement?

Accepted Answer

The block will move to the left with a force of 2N

Answer

The block will move to the left with a force of 12N

Answer

The block will move to the right with a force of 12 N

Answer

The block will move to the right with a force of 2N

Question 4

Two forces have a net force of zero. What are they most likely called?

Accepted Answer

balanced forces

Answer

congruent forces

Answer

equal forces

Answer

even forces

Question 5

An object has two forces applied to it in the same direction. Which of the following is a true statement?

Accepted Answer

The forces are added,and the object will move in that direction.

Answer

The forces are added,and the object will move in a different direction.

Answer

The forces are subtracted,and the object will move in that direction.

Answer

The forces are subtracted,and the object will move in a different direction.

Question 6

The larger the inertia, the ___ the mass.

Accepted Answer

larger

Answer

slower

Answer

quicker

Answer

smaller

Question 7

Which has the greatest inertia?

Accepted Answer

a bowling ball

Answer

a golf ball

Answer

a ping pong ball

Answer

a basketball

Question 8

Two teams are playing tug of war in PE. Team A is pulling to the right with a force of 500N. Team B is pulling to the left with a force of 400N. What will most likely occur?

Accepted Answer

Team B will be pulled to the right

Answer

Team A will be pulled to the left

Answer

Team A will be pulled to the right

Answer

Team B will be pulled to the left

Question 9

Which of the following best describes inertia?

Accepted Answer

The tendency of an object to resist a change in its motion

Answer

A push or pull that changes the speed or direction of an object

Answer

Measure on an object's inertia

Answer

Direction and distance from a start point to an end point

Question 10

You are pulled down toward the ground by which force?

Accepted Answer

gravity

Answer

inertia

Answer

sliding friction

Answer

static friction

Question 11

Jalen's dog, Sam, loves to ride in the car, but he has a difficult time staying on the seat when the car comes to a sudden stop. Which provides the best scientific reasoning for this?

Accepted Answer

Because of inertia, Sam remains in motion even as the car comes to a stop

Answer

Sam does not weigh enough to be able to come to a stop with the car

Answer

Sam likes to jump and look out the window when the car comes to a stop

Answer

Because of displacement, Sam remains in motion even as the cor comes to a stop

Question 12

Which of Newton's laws states that an object moving at a constant velocity and direction will continue to do so until a net force acts upon that object?

Accepted Answer

Newton's First Law of Motion

Answer

Newton's Second Law of Motion

Answer

Newton's Third Law of Motion

Answer

Newton's Fourth Law of Motion

Question 13

Which of Newton's laws is also known as the Law of Inertia?

Accepted Answer

Newton's First Law of Motion

Answer

Newton's Second Law of Motion

Answer

Newton's Third Law of Motion

Answer

Newton's Fourth Law of Motion

Question 14

Which of Newton's laws states that for every action, there is an equal and opposite reaction?

Accepted Answer

Newton's Third Law of Motion

Answer

Newton's First Law of Motion

Answer

Newton's Second Law of Motion

Answer

Newton's Fourth Law of Motion

Question 15

Which of Newton's laws states that the net force acting on an object causes that object to move in the direction of the net force?

Accepted Answer

Newton's Second Law of Motion

Answer

Newton's First Law of Motion

Answer

Newton's Third Law of Motion

Answer

Newton's Fourth Law of Motion

Question 16

What is the formula for Speed?

Accepted Answer

Speed= Distance/Time

Answer

Speed= DistanceXTime

Answer

Speed=Distance+Time

Answer

Speed=Distance-Time

Question 17

What is the formula for work?

Accepted Answer

Force X Distance

Answer

Force / Distance

Answer

Force - Distance

Answer

Force + Distance

Question 18

A bike travels 8 meters in 2 seconds, what is the speed of the bike?

Accepted Answer

4 m/s

Answer

40 m/s

Answer

16 m/s

Answer

.16 m/s

Question 19

What force pulls the marble toward the bottom of the ramp?

Accepted Answer

gravity

Answer

electricity

Answer

friction

Answer

magnetism

Question 20

In the distance versus time graph such as the one pictured, a straight line means

Accepted Answer

the speed was constant

Answer

the speed was increasing

Answer

the speed was decreasing

Answer

the object was at rest

Question 21

An electric skateboard travels north at 20 miles per hour. The most correct type of motion is

Accepted Answer

velocity

Answer

speed

Answer

acceleration

Answer

at rest

Question 22

Predict what will happen if the pairs pull with force shown in the picture?

Accepted Answer

The pair pulling with 12N of force will move the flag to their side

Answer

Balance forces will not allow the flag to move

Answer

The pair pulling with 10N of force will move the flag to their side

Answer

The forces will cancel each other out the flag will not move

Question 23

What will slow the box as it slides to the bottom of the ramp?

Accepted Answer

friction

Answer

gravity

Answer

inertia

Answer

magnetism

Question 24

Calculate the Net Force.

Accepted Answer

60N, Right

Answer

60N, Left

Answer

40N, Right

Answer

0N

Question 25

What is this tool used to measure?

Accepted Answer

force

Answer

temperature

Answer

length

Answer

distance

Question 26

.....................is a force that pulls objects together. On Earth, it is a force that pulls all objects to Earth's center.

Accepted Answer

Gravity

Answer

Forces

Answer

Air Resistance

Answer

Mass

Question 27

..................is the amount of matter in an object

Accepted Answer

Mass

Answer

Matter

Answer

Force

Answer

Gravity

Question 28

...................is a force caused by two things rubbing against each other.

Accepted Answer

Friction

Answer

Force

Answer

Gravity

Answer

Mass

Question 29

Forces that are equal in size and opposite in direction are called...............

Accepted Answer

balanced forces

Answer

unbalanced forces

Question 30

Forces that are not equal in size and opposite in direction are called ....................

Accepted Answer

unbalanced forced

Answer

balanced forces

Question 31

The same ..................will accelerate a small mass more than a large mass.

Accepted Answer

force

Answer

mass

Question 32

The term for when an object speeds up, slows down, or changes direction

Accepted Answer

Acceleration

Answer

Speed

Answer

Velocity

Answer

Newtons

Question 33

How much force is required to accelerate 10 kg at a rate of 100 m/s²?

Accepted Answer

1,000N

Answer

1,000kg

Answer

10N

Answer

10kg

Question 34

The net force of the following diagram is

Accepted Answer

160 N

Answer

20 N

Answer

Moving to the left

Answer

Balanced forces

Question 35

If forces acting on an object are balanced, then there _________ be a change in motion

Accepted Answer

will not

Answer

will

Question 36

When an object is acted on by unbalanced forces, the object will

Accepted Answer

accelerate in the direction of the unbalanced force

Answer

continue in the same direction

Answer

continue at the same speed

Answer

will have no change in motion

Question 37

Which runner won the race?

Accepted Answer

A

Answer

B

Answer

C

Question 38

How much force is needed to accelerate a 3kg skateboard at 5m/s^2.

Accepted Answer

15N

Answer

8N

Answer

1.6N

Answer

0.6N

Question 39

Which graph represents zero acceleration (constant velocity)?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 40

What is buoyant force?

Accepted Answer

An upward force exerted by fluids on an object.

Answer

An downward force exerted by fluids on an object.

Question 41

The buoyant force on floating objects equals the weight of the floating object

Accepted Answer

true

Answer

false

Question 42

When the weight of an object is greater than the buoyant force, the object will ...

Accepted Answer

Sink

Answer

Float

Answer

Expand

Answer

Shrink

Question 43

Archimedes' Principle states that...

Accepted Answer

The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.

Answer

The buoyant force acting on an object equals the volume of the fluid displaced by the object.

Answer

The buoyant force acting on an object will always be equal.

Question 44

The ship was able to float in the water because its weight was the same as the weight of the water it displaced.

Accepted Answer

True

Answer

False

Question 45

True or false... "mass" is the exact same thing as "weight"?

Accepted Answer

False

Answer

True

Question 46

An object is falling downward through Earth's atmosphere. In which direction is the air resistance force?

Accepted Answer

Up

Answer

Down

Answer

Around the object

Answer

Through the object

Question 47

A force which causes objects to fall is

Accepted Answer

gravity

Answer

weight

Answer

air resistance

Answer

absorbency

Question 48

When a falling object stops accelerating and falls at a constant speed, it is

Accepted Answer

terminal velocity

Answer

fluency

Answer

constant velocity

Answer

acceleration

Question 49

A push or a pull.

Accepted Answer

Force

Answer

Gravity

Answer

Motion

Question 50

When you drop a hammer and a feather on the moon what will happen? There is no air on the moon.

Accepted Answer

They will hit at the same time

Answer

The hammer will hit first

Answer

The feather will hit first

Question 51

What is a parachute designed to maximize?

Accepted Answer

Air Resistance

Answer

Gravity

Answer

Air Pressure

Answer

Thrust

Question 52

Look at the pictures of the cars. Which car will have the most air resistance force acting upon it? They will be moving at the same speed.

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

All will have equal air resistance force.

Question 53

The closer two objects are to each other

Accepted Answer

have a stronger gravitational force

Answer

the harder they will land

Answer

have no gravitational force

Answer

yep

Question 54

As mass increases, what happens to gravitational force?

Accepted Answer

increases

Answer

decreases

Answer

stays the same

Answer

i don't know

Question 55

The resistance of an object to a change in its motion is

Accepted Answer

inertia

Answer

circumference

Answer

air resistance

Answer

weight

Question 56

The momentum of an object depends upon the object's ___________&_____________.

Accepted Answer

mass and veloctiy

Answer

size and shape

Answer

mass and speed

Answer

mass and energy

Question 57

The equation to calculate momentum is

Accepted Answer

p=mv

Answer

p=1/2mv2

Answer

p=mgh

Answer

p=mg

Question 58

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

Accepted Answer

20000 Kg * m/s south

Answer

20000 N

Answer

20000 Joules

Answer

10000 kg * m/s south

Question 59

As distance between two objects increase the pull of gravity

Accepted Answer

Decreases

Answer

Increases

Answer

Stays the same

Question 60

Which of the following will not change in different gravitational fields?

Accepted Answer

mass

Answer

weight

Answer

force

Answer

pounds

Question 61

Where would you have to travel to reduce your weight but not lose any mass?

Accepted Answer

The moon

Answer

The Sun

Answer

Jupiter

Answer

Saturn

Grade 8 Forces and Motion

62 questions

Which of the following best describes a force?

Speed is determined based on two factors. What are they?

Sarah and Joy are pushing against a block in opposite directions. Sarah is pushing to the right with a force of 10N and Joy is pushing to the left with a force of 12N Which is an accurate statement?

Two forces have a net force of zero. What are they most likely called?

An object has two forces applied to it in the same direction. Which of the following is a true statement?

The larger the inertia, the ___ the mass.

Which has the greatest inertia?

Two teams are playing tug of war in PE. Team A is pulling to the right with a force of 500N. Team B is pulling to the left with a force of 400N. What will most likely occur?

Which of the following best describes inertia?

You are pulled down toward the ground by which force?

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