Newton's Laws of Motion: Interactive Quizzes and Practice Questions

Question 1

Which of the following forces is NOT a fundamental force?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Electromagnetic force

Answer

Nuclear force

Question 2

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

Accepted Answer

A book resting on a table

Answer

A car accelerating down a hill

Answer

A ball thrown into the air

Answer

A person jumping up

Question 3

Which of the following is a free-body diagram?

Accepted Answer

A diagram that shows all the forces acting on an object

Answer

A diagram that shows the object's position and velocity

Answer

A diagram that shows the object's acceleration

Answer

A diagram that shows the object's mass

Question 4

Which of the following is an application of Newton's third law of motion?

Accepted Answer

Rocket propulsion

Answer

Walking

Answer

Swimming

Answer

Flying

Question 5

Which scenario does NOT illustrate Newton's third law of motion (action-reaction pairs)?

Accepted Answer

A book resting on a table

Answer

A person pushing a wall

Answer

A rocket engine firing

Answer

A hammer hitting a nail

Question 6

A free-body diagram is a representation that:

Accepted Answer

Shows all the forces acting on an object

Answer

Describes the motion of an object

Answer

Predicts the future trajectory of an object

Answer

Calculates the energy of an object

Question 7

The principle of superposition in mechanics states that:

Accepted Answer

The total force acting on an object is equal to the sum of the individual forces acting on it

Answer

The total acceleration of an object is equal to the sum of the individual accelerations due to each force

Answer

The total momentum of a system is equal to the vector sum of the momenta of its constituent particles

Answer

The total energy of a system is equal to the sum of the energies of its constituent particles

Question 8

Which of the following is NOT a consequence of Newton's first law of motion?

Accepted Answer

The acceleration of an object is directly proportional to the applied force.

Answer

An object at rest tends to remain at rest.

Answer

An object in motion tends to remain in motion at a constant velocity.

Answer

An applied force is necessary to change the motion of an object.

Question 9

A car accelerates from rest at a constant rate of 5 m/s² for 10 seconds. What is its final velocity?

Accepted Answer

25 m/s

Answer

10 m/s

Answer

50 m/s

Answer

100 m/s

Question 10

Which of the following forces is a non-contact force?

Accepted Answer

Gravitational force

Answer

Friction

Answer

Tension

Answer

Normal force

Question 11

According to Newton's third law of motion, for every action, there is an equal and opposite:

Accepted Answer

Force

Answer

Velocity

Answer

Acceleration

Answer

Momentum

Question 12

According to Newton's first law of motion, what happens to an object at rest?

Accepted Answer

It remains at rest until acted upon by an external force.

Answer

It accelerates at a constant rate.

Answer

It moves with a constant velocity.

Answer

It decelerates to a stop.

Question 13

A 5 kg mass is subject to a force of 20 N. What is the acceleration of the mass?

Accepted Answer

1 m/s²

Answer

0.25 m/s²

Answer

4 m/s²

Answer

20 m/s²

Question 14

Which of the following is NOT a type of force?

Accepted Answer

Energy

Answer

Gravitational force

Answer

Electromagnetic force

Answer

Normal force

Question 15

A rocket engine operates on the principle of:

Accepted Answer

Newton's third law of motion

Answer

Conservation of momentum

Answer

Gravitational force

Answer

Electromagnetic force

Question 16

What is the purpose of a free-body diagram?

Accepted Answer

To represent all the forces acting on an object

Answer

To show the object's position and velocity

Answer

To calculate the object's acceleration

Answer

To determine the object's momentum

Question 17

A balanced force is characterized by:

Accepted Answer

Equal and opposite forces acting on an object

Answer

Forces acting in the same direction on an object

Answer

Forces that cause an object to accelerate

Answer

Forces that cause an object to decelerate

Question 18

The momentum of an object is defined as:

Accepted Answer

The product of its mass and velocity

Answer

The product of its force and time

Answer

The product of its acceleration and displacement

Answer

The product of its energy and velocity

Question 19

In a collision, the total momentum of the system:

Accepted Answer

Is always conserved

Answer

Is always zero

Answer

Is always positive

Answer

Is always negative

Question 20

A limitation of Newton's laws of motion is that they:

Accepted Answer

Do not apply to objects moving at very high speeds

Answer

Do not account for the effects of gravity

Answer

Do not apply to objects with changing mass

Answer

Do not apply to objects in a vacuum

Question 21

The SI unit of force is the:

Accepted Answer

Newton (N)

Answer

Kilogram (kg)

Answer

Meter (m)

Question 22

Which of the following physical quantities is a vector?

Accepted Answer

Velocity

Answer

Mass

Answer

Temperature

Question 23

In uniform circular motion, the direction of the net force acting on an object is:

Accepted Answer

Towards the center of the circle

Answer

Away from the center of the circle

Answer

Tangential to the circle

Question 24

The purpose of a free-body diagram is to:

Accepted Answer

Represent the forces acting on an object

Answer

Calculate the acceleration of an object

Answer

Determine the velocity of an object

Question 25

Which of the following is NOT a law of motion proposed by Isaac Newton?

Accepted Answer

The total momentum of an isolated system remains constant.

Answer

An object at rest stays 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 acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the mass of the object.

Answer

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

Question 26

Which of the following diagrams accurately represents the free-body diagram for a ball in free fall?

Accepted Answer

[Image of a free-body diagram with a downward arrow labeled 'mg' for the gravitational force]

Answer

[Image of a free-body diagram with an upward arrow labeled 'mg' for the gravitational force]

Answer

[Image of a free-body diagram with no arrows]

Answer

[Image of a free-body diagram with an arrow labeled 'mg' pointing to the right]

Question 27

A car travels around a curve with a radius of 100 m at a speed of 20 m/s. Calculate the centripetal force acting on the car.

Accepted Answer

400 N

Answer

200 N

Answer

100 N

Answer

50 N

Question 28

Which of the following statements accurately describes an object in equilibrium?

Accepted Answer

The net force acting on the object is zero.

Answer

The object moves with constant velocity.

Answer

The object accelerates.

Answer

The object decelerates.

Question 29

State Newton's first law of motion.

Accepted Answer

An object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity unless acted upon by an external force.

Answer

An object at rest will accelerate until acted upon by an external force.

Answer

An object in motion will accelerate until acted upon by an external force.

Answer

An object in motion will come to rest unless acted upon by an external force.

Question 30

Describe the relationship between the action-reaction forces in Newton's third law of motion.

Accepted Answer

They are equal in magnitude and opposite in direction.

Answer

They are unequal in magnitude and in the same direction.

Answer

They are unequal in magnitude and opposite in direction.

Answer

They are equal in magnitude and in the same direction.

Question 31

Identify which of the following is NOT a type of force that can act on an object.

Accepted Answer

Emotional force

Answer

Gravitational force

Answer

Magnetic force

Answer

Frictional force

Question 32

Select the correct free-body diagram for an object in equilibrium.

Accepted Answer

Image of a free-body diagram with balanced forces

Answer

Image of a free-body diagram with only one force

Answer

Image of a free-body diagram with no forces

Answer

Image of a free-body diagram with unbalanced forces

Question 33

Which of Newton's laws of motion states that an object at rest will remain at rest unless an outside force acts on it?

Accepted Answer

First law

Answer

Second law

Answer

Third law

Question 34

A car of mass 1000 kg is accelerating at 2 m/s². What is the net force acting on the car?

Accepted Answer

2000 N

Answer

500 N

Answer

1000 N

Question 35

For every action, there is an equal and opposite reaction. Which law of motion is this?

Accepted Answer

Newton's third law

Answer

Newton's second law

Answer

Newton's first law

Question 36

Which of the following is not a type of force?

Accepted Answer

Velocity

Answer

Friction

Answer

Gravity

Question 37

A ball is thrown vertically upwards. At the highest point of its path, which force acts on the ball?

Accepted Answer

Gravity

Answer

Air resistance

Answer

Friction

Question 38

A car travels at a steady speed of 10 m/s. What is the net force on the car?

Accepted Answer

Zero

Answer

20 N

Answer

10 N

Question 39

What is the SI unit of force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Meter

Question 40

A book is resting on a table. Which force does not act on the book?

Accepted Answer

Tension

Answer

Normal force

Answer

Gravity

Question 41

A rocket launches vertically upwards from Earth's surface. Which force is the greatest at launch?

Accepted Answer

Thrust

Answer

Normal force

Answer

Gravity

Question 42

What force keeps a satellite in a circular orbit around Earth?

Accepted Answer

Gravitational force

Answer

Centrifugal force

Answer

Nuclear force

Answer

Electromagnetic force

Question 43

A ball thrown upwards at 10 m/s. What's its velocity at the highest point?

Accepted Answer

0 m/s

Answer

5 m/s

Answer

-10 m/s

Answer

15 m/s

Question 44

A car of mass 1000 kg accelerates from rest to 20 m/s in 10 seconds. What is the average force acting on the car?

Accepted Answer

2000 N

Answer

1000 N

Answer

100 N

Answer

200 N

Question 45

A stationary object will remain stationary unless acted upon by a net external force. This statement describes:

Accepted Answer

Newton's First Law of Motion

Answer

The Law of Conservation of Momentum

Answer

Newton's Third Law of Motion

Answer

Newton's Second Law of Motion

Question 46

A 5 kg object is at rest on a horizontal surface. The coefficient of static friction between the object and the surface is 0.4. What is the minimum force required to start the object moving?

Accepted Answer

19.6 N

Answer

20 N

Answer

5 N

Answer

10 N

Question 47

A 10 kg object is being pulled horizontally by a force of 50 N. If the object experiences a frictional force of 10 N, what is the acceleration of the object?

Accepted Answer

4 m/s²

Answer

10 m/s²

Answer

5 m/s²

Answer

1 m/s²

Question 48

A rocket accelerates upwards due to the force exerted by the expelled exhaust gases. This is an example of:

Accepted Answer

Newton's Third Law of Motion

Answer

Newton's First Law of Motion

Answer

Newton's Second Law of Motion

Question 49

Two objects, one with a mass of 1 kg and the other with a mass of 5 kg, collide head-on. Which object experiences a greater force during the collision?

Accepted Answer

Both experience the same force

Answer

The 1 kg object

Answer

It depends on the velocity of each object

Answer

The 5 kg object

Question 50

A ball is thrown vertically upwards. What is the net force acting on the ball at the highest point of its trajectory?

Accepted Answer

The force of gravity

Answer

The force of the throw

Answer

Zero

Answer

The force of air resistance

Question 51

A free-body diagram is a useful tool for analyzing forces acting on an object. Which of the following is NOT typically included in a free-body diagram?

Accepted Answer

The object's velocity

Answer

Friction

Answer

The normal force

Answer

The force of gravity

Question 52

A person is standing on a scale in an elevator. If the elevator is accelerating upwards, what will the scale reading be?

Accepted Answer

Greater than the person's actual weight

Answer

Less than the person's actual weight

Answer

Equal to the person's actual weight

Question 53

A car is traveling at a constant speed around a circular track. Which of the following statements is TRUE?

Accepted Answer

The car is accelerating because its direction is changing

Answer

The car is not accelerating because its speed is constant

Answer

The car is accelerating only when it is speeding up or slowing down