Motion and Forces: Interactive Learning Quizzes for 8th Grade Science

Question 1

A car increases its speed from 0 to 60 mph in 10 seconds. What is the car's acceleration?

Accepted Answer

12 mph/s

Answer

6 mph/s

Answer

18 mph/s

Answer

24 mph/s

Question 2

Which of the following is not a force?

Accepted Answer

Temperature

Answer

Friction

Answer

Gravity

Answer

Electricity

Question 3

The work done by a force is equal to the force applied multiplied by the:

Accepted Answer

Distance moved in the direction of the force

Answer

Time taken

Answer

Mass of the object

Answer

Speed of the object

Question 4

Which of the following is NOT a type of force that can affect the motion of an object?

Accepted Answer

Fictitious force

Answer

Contact force

Answer

Non-contact force

Answer

Gravitational force

Question 5

Energy is a scalar quantity that describes the:

Accepted Answer

Ability to do work

Answer

Amount of force applied

Answer

Direction of motion

Answer

Rate of acceleration

Question 6

A force of 50 N is applied to a 10 kg object. What is the object's acceleration?

Accepted Answer

5 m/s^2

Answer

50 m/s^2

Answer

500 m/s^2

Answer

Cannot be determined without more information

Question 7

Which of the following factors does NOT affect the strength of friction?

Accepted Answer

Temperature

Answer

Surface roughness

Answer

Type of materials in contact

Answer

Area of contact

Question 8

Which unit is used to measure power?

Accepted Answer

Watts

Answer

Joules

Answer

Newtons

Answer

Meters per second

Question 9

A machine has an efficiency of 60%. If 100 J of energy is put into the machine, how much useful energy is produced?

Accepted Answer

60 J

Answer

40 J

Answer

80 J

Answer

100 J

Question 10

Which of the following is an example of a non-contact force?

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Normal force

Question 11

Which of the following is NOT a factor that affects the amount of friction between two surfaces?

Accepted Answer

Time

Answer

Surface roughness

Answer

Temperature

Answer

Type of materials in contact

Question 12

Power is equal to:

Accepted Answer

Work divided by time

Answer

Force multiplied by distance

Answer

Energy divided by time

Answer

Mass multiplied by acceleration

Question 13

According to Newton's second law of motion, the acceleration of an object is directly proportional to:

Accepted Answer

The net force acting on the object

Answer

The mass of the object

Answer

The velocity of the object

Answer

The time of motion

Question 14

Which of the following is a unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Meter

Question 15

A car travels 100 meters in 10 seconds. What is its average velocity?

Accepted Answer

10 m/s

Answer

100 m/s

Answer

1000 m/s

Answer

1 m/s

Question 16

The law of conservation of energy states that:

Accepted Answer

Energy can be converted from one form to another

Answer

Energy can be created or destroyed

Answer

Energy decreases over time

Answer

Energy increases over time

Question 17

A force of 10 Newtons is applied to an object of mass 2 kilograms. What is the object's acceleration?

Accepted Answer

2 m/s^2

Answer

5 m/s^2

Answer

10 m/s^2

Answer

20 m/s^2

Question 18

Which of the following is a renewable energy source?

Accepted Answer

Solar energy

Answer

Fossil fuels

Answer

Nuclear energy

Answer

Natural gas

Question 19

The work done by a force is calculated as:

Accepted Answer

Force times distance moved in the direction of the force

Answer

Force times time

Answer

Distance moved times time

Answer

Mass times acceleration

Question 20

Which of the following is not a law of motion described by Isaac Newton?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

An object at rest remains at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Answer

The change in motion of an object is directly proportional to the net force applied to the object and inversely proportional to the object's mass.

Answer

For every action, there is an equal and opposite reaction.

Question 21

A car traveling at a constant velocity encounters a strong headwind. What is the effect of the headwind on the net force acting on the car?

Accepted Answer

It decreases the net force.

Answer

It increases the net force.

Answer

It does not affect the net force.

Answer

It increases the force of friction acting on the car.

Question 22

Which of the following is a non-renewable energy source?

Accepted Answer

Fossil fuels

Answer

Solar energy

Answer

Hydropower

Answer

Wind energy

Question 23

What is the difference between speed and velocity?

Accepted Answer

Speed is a scalar quantity that measures the rate of motion, while velocity is a vector quantity that measures the rate of motion in a specific direction.

Answer

Velocity is a scalar quantity that measures the rate of motion, while speed is a vector quantity that measures the rate of motion in a specific direction.

Answer

Speed and velocity are both scalar quantities.

Answer

Speed and velocity are both vector quantities.

Question 24

Which of the following is NOT a factor that affects the force of friction?

Accepted Answer

The temperature

Answer

The surface area in contact

Answer

The coefficient of friction

Answer

The normal force

Question 25

A block slides across a frictionless surface at a constant speed. According to Newton's first law of motion, what is the net force acting on the block?

Accepted Answer

Zero

Answer

Greater than zero

Answer

Less than zero

Answer

In the opposite direction of motion

Question 26

Which of these is a vector quantity?

Accepted Answer

Velocity

Answer

Speed

Answer

Mass

Question 27

When you lift a book, what kind of energy transformation is taking place?

Accepted Answer

Gravitational potential energy to kinetic energy

Answer

Kinetic energy to gravitational potential energy

Answer

Thermal energy to light energy

Question 28

Which factor does NOT affect the amount of friction between two surfaces?

Accepted Answer

Speed of movement

Answer

Normal force

Answer

Surface roughness

Question 29

What is the third law of motion often called?

Accepted Answer

Law of Action and Reaction

Answer

Law of Inertia

Answer

Law of Acceleration

Question 30

Which of the following is a non-renewable energy source?

Accepted Answer

Coal

Answer

Solar energy

Answer

Natural gas

Question 31

How are mass and weight different?

Accepted Answer

Mass is a measure of an object's inertia, while weight is a measure of the force of gravity on an object.

Answer

Mass is a measure of the force of gravity on an object, while weight is a measure of an object's inertia.

Answer

Mass and weight are the same thing.

Question 32

Which of the following is NOT necessarily a force?

Accepted Answer

Heat transfer

Answer

Gravitational pull

Answer

Magnetic attraction

Answer

Friction

Question 33

According to Newton's first law of motion, an object will remain in its current state of motion unless acted upon by an unbalanced force.

Accepted Answer

True

Answer

False

Question 34

The force of gravity between two objects is directly proportional to:

Accepted Answer

Their masses

Answer

Their distance apart

Answer

Their densities

Answer

Their volumes

Question 35

What is the unit of force in the SI system?

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Pascal

Question 36

Which of the following is an example of a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Air resistance

Answer

Tension

Question 37

How does a rocket engine function?

Accepted Answer

By expelling mass in one direction

Answer

By creating a vacuum in front of it

Answer

By using nuclear power

Answer

By generating electricity

Question 38

Which of the following units is NOT used to measure force?

Accepted Answer

Watt

Answer

Pound

Answer

Kilogram-force

Answer

Newton

Question 39

According to Newton's first law of motion, an object at rest will remain at rest, or if in motion, it will continue moving at a constant speed in a straight line, unless acted upon by an ________.

Accepted Answer

Unbalanced force

Answer

Balanced force

Answer

Friction

Answer

Gravity

Question 40

Which of the following is an example of a non-contact force?

Accepted Answer

Gravitational force

Answer

Normal force

Answer

Friction

Answer

Tension

Question 41

Which of the following is the formula for calculating kinetic energy?

Accepted Answer

1/2 mv^2

Answer

P = W/t

Answer

W = Fd

Answer

F = ma

Question 42

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Time

Answer

Mass

Answer

Speed

Question 43

Which of the following is a non-renewable source of energy?

Accepted Answer

Fossil fuels

Answer

Solar energy

Answer

Hydroelectric energy

Answer

Wind energy

Question 44

Which law states that an object at rest will remain at rest, and an object in motion will remain in motion with the same speed and in the same direction unless acted upon by an unbalanced force?

Accepted Answer

Newton's first law of motion (Law of Inertia)

Answer

Galileo's law of motion

Answer

Newton's second law of motion

Answer

Newton's third law of motion

Question 45

Which of the following is NOT a type of force?

Accepted Answer

Velocity

Answer

Magnetism

Answer

Friction

Answer

Gravity

Question 46

At the highest point of a ball's trajectory, which of the following is zero?

Accepted Answer

Vertical velocity

Answer

Acceleration due to gravity

Answer

Potential energy

Answer

Horizontal velocity

Question 47

Define work in the context of physics.

Accepted Answer

Work is done when a force is applied to an object, causing it to move over a distance in the direction of the force.

Answer

Work is only done when an object is lifted.

Answer

Work is the same as energy.

Question 48

Which of the following factors affects the acceleration due to gravity of an object in free fall?

Accepted Answer

Mass of the object

Answer

Temperature of the object

Answer

Volume of the object

Answer

Shape of the object

Question 49

Which of the following is a vector quantity?

Accepted Answer

Force

Answer

Mass

Answer

Temperature

Answer

Energy

Question 50

Which force is responsible for keeping the Moon in orbit around the Earth?

Accepted Answer

Gravitational force

Answer

Magnetic force

Answer

Centrifugal force

Answer

Frictional force