Physics

Newton’s Laws of Motion MCQs with Answer

An object will remain at rest or in uniform motion unless acted upon by:
a) A force
b) A frictional force
c) An external force
d) Its velocity

Answer
a) A force

Newton’s Second Law of Motion is mathematically expressed as:
a) F = ma
b) F = mv
c) F = m/v
d) F = m^2

Answer
a) F = ma

According to Newton’s Third Law of Motion, if you push an object, the object:
a) Pushes back with an equal and opposite force
b) Does not exert any force
c) Exerts a force of greater magnitude
d) Exerts no force unless acted upon

Answer
a) Pushes back with an equal and opposite force

Which of the following best describes Newton’s First Law of Motion?
a) An object in motion stays in motion, and an object at rest stays at rest unless acted upon by an external force
b) Force equals mass times acceleration
c) For every action, there is an equal and opposite reaction
d) The force of gravity acts on all objects the same way

Answer
a) An object in motion stays in motion, and an object at rest stays at rest unless acted upon by an external force

If a car accelerates, the net force acting on the car must be:
a) Zero
b) Balanced
c) Unbalanced
d) Constant

Answer
c) Unbalanced

Which is an example of Newton’s Second Law?
a) A rocket accelerating due to exhaust gases
b) A ball sitting on the ground
c) A person standing still in an elevator
d) A spacecraft in deep space moving at a constant speed

Answer
a) A rocket accelerating due to exhaust gases

Newton’s Third Law is often summarized by the phrase:
a) “What goes up must come down”
b) “For every action, there is an equal and opposite reaction”
c) “Energy cannot be created or destroyed”
d) “Force equals mass times acceleration”

Answer
b) “For every action, there is an equal and opposite reaction”

Which of the following would be a violation of Newton’s First Law?
a) A car continues moving after the engine is turned off
b) An object in free fall accelerates due to gravity
c) A ball rolling on a flat surface stops due to friction
d) An object remains at rest unless acted upon by a force

Answer
c) A ball rolling on a flat surface stops due to friction

An astronaut floating in space experiences no acceleration because:
a) There is no gravitational force acting on them
b) The forces acting on them are balanced
c) There is no mass in space
d) There is no air resistance in space

Answer
b) The forces acting on them are balanced

If the mass of an object is doubled, what happens to the force required to accelerate it at the same rate?
a) It is halved
b) It stays the same
c) It is doubled
d) It is quadrupled

Answer
c) It is doubled

The momentum of an object can be calculated by:
a) Mass times speed
b) Mass times velocity
c) Velocity times time
d) Force times distance

Answer
b) Mass times velocity

Which law explains why passengers in a car continue moving forward when the car suddenly stops?
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) Newton’s Law of Universal Gravitation

Answer
a) Newton’s First Law

A person pushing a box and the box moving in the direction of the applied force is an example of:
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) The Law of Inertia

Answer
b) Newton’s Second Law

When a person stands on the floor, the force the floor exerts on the person is equal and opposite to the force the person exerts on the floor. This is an example of:
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) Law of Conservation of Energy

Answer
c) Newton’s Third Law

Which of the following describes an action-reaction pair?
a) A ball hitting the floor and bouncing back
b) A car moving forward when the engine is started
c) A person jumping off a boat and the boat moving backward
d) A person walking on the ground

Answer
c) A person jumping off a boat and the boat moving backward

When a person pulls a sled, the sled accelerates in the direction of the pull. The force causing this acceleration is explained by:
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) Gravitational Force

Answer
b) Newton’s Second Law

A stationary object requires a force to get it moving, demonstrating:
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) Law of Conservation of Momentum

Answer
a) Newton’s First Law

An object with more mass will experience:
a) Less acceleration for the same force
b) More acceleration for the same force
c) No change in acceleration
d) More force needed to stop it

Answer
a) Less acceleration for the same force

Which of the following is true when you push an object with a force?
a) The object moves immediately
b) The object will stop if the force is removed
c) The object will accelerate depending on its mass
d) The object does not change motion

Answer
c) The object will accelerate depending on its mass

Newton’s First Law is also known as:
a) The Law of Inertia
b) The Law of Acceleration
c) The Action-Reaction Law
d) The Law of Universal Gravitation

Answer
a) The Law of Inertia

If you push a car with twice the force, and it accelerates at the same rate, the car’s mass must be:
a) Halved
b) Doubled
c) Tripled
d) Quadrupled

Answer
b) Doubled

When a car slows down due to friction, which of Newton’s laws is involved?
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) All of the above

Answer
b) Newton’s Second Law

According to Newton’s Third Law, when a hammer hits a nail, the nail:
a) Exerts no force back
b) Pushes the hammer with an equal and opposite force
c) Exerts a greater force on the hammer
d) Does not affect the hammer’s motion

Answer
b) Pushes the hammer with an equal and opposite force

When a rocket launches, the exhaust gases are expelled downward, and the rocket moves upward. This is an example of:
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) Newton’s Law of Inertia

Answer
c) Newton’s Third Law

Newton’s Second Law states that the acceleration of an object is directly proportional to:
a) Its mass
b) The applied force
c) Its velocity
d) The object’s resistance

Answer
b) The applied force

Which law explains why objects fall at the same rate regardless of their mass (neglecting air resistance)?
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) The Law of Universal Gravitation

Answer
b) Newton’s Second Law

An object at rest will stay at rest unless acted upon by:
a) A force
b) A frictional force
c) A gravitational pull
d) An applied force

Answer
a) A force

When a swimmer pushes against the wall of the pool, the swimmer moves in the opposite direction. This is an example of:
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
d) Law of Conservation of Momentum

Answer
c) Newton’s Third Law

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