# Newton’s Laws of Motion MCQs with Answers

Newton’s first law of motion is also known as the law of:

a) Inertia

b) Acceleration

c) Action-reaction

d) Momentum

**Answer: ** a) Inertia

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

a) Force applied to it

b) Mass of the object

c) Velocity of the object

d) Displacement of the object

**Answer: ** a) Force applied to it

The SI unit of force is the:

a) Joule

b) Newton

c) Watt

d) Kilogram

**Answer: ** b) Newton

Newton’s third law of motion states that for every action, there is an equal and opposite:

a) Reaction

b) Force

c) Acceleration

d) Momentum

**Answer: ** a) Reaction

The force of gravity acting on an object is also known as its:

a) Mass

b) Weight

c) Inertia

d) Momentum

**Answer: ** b) Weight

An object at rest will remain at rest, and an object in motion will continue in motion with constant velocity, unless acted upon by an external force. This statement is a restatement of:

a) Newton’s first law of motion

b) Newton’s second law of motion

c) Newton’s third law of motion

d) Archimedes’ principle

**Answer: ** a) Newton’s first law of motion

The acceleration produced by a net force on an object is directly proportional to the net force and inversely proportional to the:

a) Mass of the object

b) Acceleration due to gravity

c) Velocity of the object

d) Displacement of the object

**Answer: ** a) Mass of the object

The law of conservation of momentum states that the total momentum of a closed system:

a) Increases over time

b) Decreases over time

c) Remains constant

d) Varies unpredictably

**Answer: ** c) Remains constant

The force required to accelerate an object with a mass of 2 kg at a rate of 3 m/s² is:

a) 6 N

b) 2 N

c) 9 N

d) 5 N

**Answer: ** a) 6 N

An object with a mass of 5 kg is subjected to a force of 10 N. What is its acceleration?

a) 2 m/s²

b) 5 m/s²

c) 10 m/s²

d) 15 m/s²

**Answer: ** b) 2 m/s²

Which of the following best represents Newton’s second law of motion?

a) F = ma

b) F = mg

c) F = mv

d) F = mr

**Answer: ** a) F = ma

When a tennis ball is hit with a racquet, the force exerted on the ball is equal to the force exerted back on the racquet. This is an example of:

a) Newton’s first law of motion

b) Newton’s second law of motion

c) Newton’s third law of motion

d) The law of conservation of energy

**Answer: ** c) Newton’s third law of motion

The acceleration due to gravity on Earth is approximately:

a) 9.8 m/s²

b) 10 m/s²

c) 9.81 m/s²

d) 9.9 m/s²

**Answer: ** a) 9.8 m/s²

An object with a mass of 2 kg experiences a net force of 10 N. What is its acceleration?

a) 2 m/s²

b) 5 m/s²

c) 10 m/s²

d) 20 m/s²

**Answer: ** c) 10 m/s²

Which of the following statements is true according to Newton’s third law of motion?

a) Objects at rest tend to stay at rest.

b) Objects in motion tend to stay in motion with constant velocity.

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

d) The acceleration of an object is directly proportional to the net force acting on it.

**Answer: ** c) For every action, there is an equal and opposite reaction.

The force required to accelerate an object with a mass of 10 kg at a rate of 2 m/s² is:

a) 20 N

b) 5 N

c) 12 N

d) 2 N

**Answer: ** a) 20 N

An object is moving with a constant velocity of 10 m/s. According to Newton’s first law of motion, which of the following statements is true?

a) There is no net force acting on the object.

b) The object is experiencing a net force of zero.

c) The object is accelerating.

d) The object is at rest.

**Answer: ** a) There is no net force acting on the object.

The force of gravity acting on an object is directly proportional to the:

a) Mass of the object

b) Acceleration of the object

c) Volume of the object

d) Temperature of the object

**Answer: ** a) Mass of the object

A 2 kg object is subjected to a net force of 20 N. What is its acceleration?

a) 4 m/s²

b) 10 m/s²

c) 20 m/s²

d) 40 m/s²

**Answer: ** b) 10 m/s²

A car with a mass of 1000 kg accelerates at a rate of 5 m/s². What is the net force acting on the car?

a) 5000 N

b) 2000 N

c) 100 N

d) 50 N

**Answer: ** a) 5000 N

An object is at rest on a table. Which of the following statements is true according to Newton’s first law of motion?

a) The object will remain at rest.

b) The object will accelerate in the direction of the applied force.

c) The object will move with a constant velocity.

d) The object will move in the opposite direction of the applied force.

**Answer: ** a) The object will remain at rest.

The force required to accelerate an object with a mass of 5 kg at a rate of 4 m/s² is:

a) 9 N

b) 16 N

c) 20 N

d) 1 N

**Answer: ** b) 16 N

Which of the following statements is true about the concept of inertia?

a) Inertia is a measure of an object’s gravitational force.

b) Inertia is the tendency of an object to resist changes in its motion.

c) Inertia is directly proportional to the net force acting on an object.

d) Inertia is inversely proportional to an object’s acceleration.

**Answer: ** b) Inertia is the tendency of an object to resist changes in its motion.

An object with a mass of 5 kg is subjected to a net force of 15 N. What is its acceleration?

a) 1 m/s²

b) 3 m/s²

c) 5 m/s²

d) 15 m/s²

**Answer: ** b) 3 m/s²

The tendency of an object to remain at rest or in uniform motion in a straight line is called:

a) Inertia

b) Acceleration

c) Action-reaction

d) Momentum

**Answer: ** a) Inertia

An object with a mass of 10 kg experiences a net force of 50 N. What is its acceleration?

a) 5 m/s²

b) 10 m/s²

c) 50 m/s²

d) 500 m/s²

**Answer: ** b) 10 m/s²

According to Newton’s third law of motion, if you push a wall with a force of 50 N, the wall will push back on you with a force of:

a) 50 N

b) 25 N

c) 100 N

d) 0 N

**Answer: ** a) 50 N

An object is moving with a constant velocity. According to Newton’s second law of motion, which of the following statements is true?

a) There is no net force acting on the object.

b) The object is experiencing a net force of zero.

c) The object is accelerating.

d) The object is at rest.

**Answer: ** a) There is no net force acting on the object.

The acceleration due to gravity on the moon is approximately one-sixth of its value on Earth. This means that an object’s weight on the moon would be:

a) One-sixth of its weight on Earth

b) Six times its weight on Earth

c) Equal to its weight on Earth

d) Half its weight on Earth

**Answer: ** a) One-sixth of its weight on Earth

A car with a mass of 1200 kg experiences a net force of 5000 N. What is its acceleration?

a) 4.2 m/s²

b) 6.2 m/s²

c) 4.8 m/s²

d) 2.3 m/s²

**Answer: ** a) 4.2 m/s²

Which of the following statements is true about the concept of momentum?

a) Momentum is a measure of an object’s gravitational force.

b) Momentum is the tendency of an object to resist changes in its motion.

c) Momentum is directly proportional to the net force acting on an object.

d) Momentum is the product of an object’s mass and velocity.

**Answer: ** d) Momentum is the product of an object’s mass and velocity.

The acceleration produced by a net force on an object is inversely proportional to the:

a) Force applied to it

b) Mass of the object

c) Velocity of the object

d) Displacement of the object

**Answer: ** b) Mass of the object

Which of the following statements is true about an object in equilibrium?

a) The net force acting on the object is zero.

b) The object is at rest.

c) The object is moving with constant velocity.

d) All of the above

**Answer: ** d) All of the above

A 5 kg object is subjected to a net force of 20 N. What is its acceleration?

a) 4 m/s²

b) 10 m/s²

c) 20 m/s²

d) 100 m/s²

**Answer: ** b) 10 m/s²

Which of the following statements is true about the concept of force?

a) Force is a measure of an object’s mass.

b) Force is the tendency of an object to resist changes in its motion.

c) Force is directly proportional to the net acceleration of an object.

d) Force is a push or pull on an object.

**Answer: ** d) Force is a push or pull on an object.

An object with a mass of 2 kg experiences a net force of 6 N. What is its acceleration?

a) 3 m/s²

b) 4 m/s²

c) 6 m/s²

d) 12 m/s²

**Answer: ** c) 6 m/s²

According to Newton’s third law of motion, if you drop a ball, the ball will fall towards the ground due to:

a) The gravitational force of the Earth pulling it downwards.

b) The equal and opposite force of the ball pushing back on the Earth.

c) The ball’s inertia.

d) The ball’s mass.

**Answer: ** b) The equal and opposite force of the ball pushing back on the Earth.

The force required to accelerate an object with a mass of 4 kg at a rate of 2 m/s² is:

a) 2 N

b) 4 N

c) 8 N

d) 16 N

**Answer: ** c) 8 N

An object with a mass of 10 kg experiences a net force of 100 N. What is its acceleration?

a) 1 m/s²

b) 10 m/s²

c) 100 m/s²

d) 1000 m/s²

**Answer: ** b) 10 m/s²

The law of inertia is a restatement of which of Newton’s laws of motion?

a) First law

b) Second law

c) Third law

d) None of the above

**Answer: ** a) First law

A 10 kg object is subjected to a net force of 50 N. What is its acceleration?

a) 5 m/s²

b) 10 m/s²

c) 15 m/s²

d) 20 m/s²

**Answer: ** a) 5 m/s²

An object is moving with a constant velocity of 8 m/s. According to Newton’s first law of motion, which of the following statements is true?

a) There is no net force acting on the object.

b) The object is experiencing a net force of zero.

c) The object is accelerating.

d) The object is at rest.

**Answer: ** a) There is no net force acting on the object.

The force of gravity acting on an object is directly proportional to the:

a) Mass of the object

b) Acceleration of the object

c) Volume of the object

d) Temperature of the object

**Answer: ** a) Mass of the object

An object with a mass of 2 kg is subjected to a net force of 10 N. What is its acceleration?

a) 2.5 m/s²

b) 4 m/s²

c) 5 m/s²

d) 10 m/s²

**Answer: ** c) 5 m/s²

The force required to accelerate an object with a mass of 3 kg at a rate of 4 m/s² is:

a) 7 N

b) 12 N

c) 16 N

d) 24 N

**Answer: ** b) 12 N

An object with a mass of 5 kg is subjected to a net force of 25 N. What is its acceleration?

a) 2 m/s²

b) 5 m/s²

c) 25 m/s²

d) 125 m/s²

**Answer: ** b) 5 m/s²

The tendency of an object to remain at rest or in uniform motion in a straight line is called:

a) Inertia

b) Acceleration

c) Action-reaction

d) Momentum

**Answer: ** a) Inertia

An object with a mass of 10 kg experiences a net force of 20 N. What is its acceleration?

a) 2 m/s²

b) 5 m/s²

c) 10 m/s²

d) 15 m/s²

**Answer: ** a) 2 m/s²

According to Newton’s third law of motion, if you push a wall with a force of 100 N, the wall will push back on you with a force of:

a) 100 N

b) 50 N

c) 200 N

d) 0 N

**Answer: ** a) 100 N

An object is moving with a constant velocity. According to Newton’s second law of motion, which of the following statements is true?

a) There is no net force acting on the object.

b) The object is experiencing a net force of zero.

c) The object is accelerating.

d) The object is at rest.

**Answer: ** a) There is no net force acting on the object.

The acceleration due to gravity on the moon is approximately one-sixth of its value on Earth. This means that an object’s weight on the moon would be:

a) One-sixth of its weight on Earth

b) Six times its weight on Earth

c) Equal to its weight on Earth

d) Half its weight on Earth

**Answer: ** a) One-sixth of its weight on Earth

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

a) 2000 N

b) 500 N

c) 100 N

d) 50 N

**Answer: ** a) 2000 N

Which of the following statements is true about an object in equilibrium?

a) The net force acting on the object is zero.

b) The object is at rest.

c) The object is moving with constant velocity.

d) All of the above

**Answer: ** d) All of the above

A 2 kg object is subjected to a net force of 8 N. What is its acceleration?

a) 2 m/s²

b) 4 m/s²

c) 6 m/s²

d) 8 m/s²

**Answer: ** c) 6 m/s²

Which of the following statements is true about the concept of force?

a) Force is a measure of an object’s mass.

b) Force is the tendency of an object to resist changes in its motion.

c) Force is directly proportional to the net acceleration of an object.

d) Force is a push or pull on an object.

**Answer: ** d) Force is a push or pull on an object.

An object with a mass of 2 kg experiences a net force of 4 N. What is its acceleration?

a) 1 m/s²

b) 2 m/s²

c) 4 m/s²

d) 8 m/s²

**Answer: ** b) 2 m/s²

According to Newton’s third law of motion, if you drop a ball, the ball will fall towards the ground due to:

a) The gravitational force of the Earth pulling it downwards.

b) The equal and opposite force of the ball pushing back on the Earth.

c) The ball’s inertia.

d) The ball’s mass.

**Answer: ** b) The equal and opposite force of the ball pushing back on the Earth.

The force required to accelerate an object with a mass of 6 kg at a rate of 3 m/s² is:

a) 9 N

b) 18 N

c) 27 N

d) 36 N

**Answer: ** b) 18 N

An object with a mass of 4 kg is subjected to a net force of 20 N. What is its acceleration?

a) 2.5 m/s²

b) 5 m/s²

c) 8 m/s²

d) 10 m/s²

**Answer: ** b) 5 m/s²

The tendency of an object to resist changes in its motion is called:

a) Inertia

b) Acceleration

c) Action-reaction

d) Momentum

**Answer: ** a) Inertia

An object with a mass of 10 kg experiences a net force of 30 N. What is its acceleration?

a) 3 m/s²

b) 6 m/s²

c) 10 m/s²

d) 30 m/s²

**Answer: ** b) 6 m/s²

According to Newton’s third law of motion, if you push a wall with a force of 80 N, the wall will push back on you with a force of:

a) 80 N

b) 40 N

c) 160 N

d) 0 N

**Answer: ** a) 80 N

An object is moving with a constant velocity. According to Newton’s second law of motion, which of the following statements is true?

a) There is no net force acting on the object.

b) The object is experiencing a net force of zero.

c) The object is accelerating.

d) The object is at rest.

**Answer: ** a) There is no net force acting on the object.

The acceleration due to gravity on the moon is approximately one-sixth of its value on Earth. This means that an object’s weight on the moon would be:

a) One-sixth of its weight on Earth

b) Six times its weight on Earth

c) Equal to its weight on Earth

d) Half its weight on Earth

**Answer: ** a) One-sixth of its weight on Earth

A car with a mass of 1500 kg accelerates at a rate of 3 m/s². What is the net force acting on the car?

a) 4500 N

b) 500 N

c) 150 N

d) 50 N

**Answer: ** a) 4500 N

Which of the following statements is true about an object in equilibrium?

a) The net force acting on the object is zero.

b) The object is at rest.

c) The object is moving with constant velocity.

d) All of the above

**Answer: ** d) All of the above

A 3 kg object is subjected to a net force of 9 N. What is its acceleration?

a) 1 m/s²

b) 3 m/s²

c) 6 m/s²

d) 9 m/s²

**Answer: ** c) 6 m/s²

According to Newton’s third law of motion, if you drop a ball, the ball will fall towards the ground due to:

a) The gravitational force of the Earth pulling it downwards.

b) The equal and opposite force of the ball pushing back on the Earth.

c) The ball’s inertia.

d) The ball’s mass.

**Answer: ** b) The equal and opposite force of the ball pushing back on the Earth.

The force required to accelerate an object with a mass of 8 kg at a rate of 2 m/s² is:

a) 4 N

b) 8 N

c) 16 N

d) 32 N

**Answer: ** c) 16 N

An object with a mass of 6 kg experiences a net force of 30 N. What is its acceleration?

a) 2 m/s²

b) 5 m/s²

c) 10 m/s²

d) 25 m/s²

**Answer: ** b) 5 m/s²