Newton's Laws of Motion: Master the Fundamentals of Classical Mechanics

Question 1

An object with a mass of 10 kg is acted upon by a force of 20 N. What is the acceleration of the object?

Accepted Answer

2 m/s²

Answer

0.5 m/s²

Answer

1 m/s²

Answer

4 m/s²

Question 2

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

Accepted Answer

The net force on an object is always non-zero.

Answer

Every action has an equal and opposite reaction.

Answer

Forces always occur in pairs.

Answer

Momentum is conserved in a closed system.

Question 3

A satellite orbits Earth in a circular path. Which of the following forces is responsible for keeping the satellite in orbit?

Accepted Answer

Gravity

Answer

Friction

Answer

Centrifugal force

Answer

Normal force

Question 4

Which of the following quantities is NOT a fundamental quantity in Newton's laws of motion?

Accepted Answer

Energy

Answer

Mass

Answer

Velocity

Answer

Time

Question 5

According to Newton's second law of motion, the force exerted on an object is directly proportional to its:

Accepted Answer

Acceleration

Answer

Mass

Answer

Velocity

Answer

Momentum

Question 6

Newton's third law of motion states that:

Accepted Answer

For every action, there is an equal and opposite reaction

Answer

The total momentum of a closed system remains constant

Answer

The force of gravity between two objects is directly proportional to their masses and inversely proportional to the square of the distance between them

Answer

The work done by a force is equal to the change in kinetic energy of the object on which the force is applied

Question 7

Which of the following is a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Air resistance

Question 8

Which of the following is an example of a non-inertial reference frame?

Accepted Answer

A rotating turntable

Answer

A car moving at constant velocity

Answer

A person standing on a weighing scale

Answer

A satellite in orbit around the Earth

Question 9

According to Newton's Second Law, which equation describes the relationship between an object's mass, acceleration, and force?

Accepted Answer

F = ma

Answer

F = v/t

Answer

a = vt

Answer

v = at

Question 10

Which of the following is NOT an example of an inertial frame of reference?

Accepted Answer

A person standing on a rotating platform

Answer

A car traveling at a constant speed on a straight road

Answer

A rocket accelerating upwards

Answer

A spacecraft orbiting the Earth

Question 11

According to Newton's Third Law, for every action, there is an equal and opposite:

Accepted Answer

Force

Answer

Acceleration

Answer

Momentum

Answer

Energy

Question 12

A ball is thrown vertically upwards with an initial velocity of 20 m/s. What is its velocity at the highest point of its trajectory?

Accepted Answer

0 m/s

Answer

10 m/s

Answer

20 m/s

Answer

30 m/s

Question 13

Which of the following is the SI unit of force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Pascal

Answer

Joule

Question 14

Which of the following is a type of motion in which an object travels in a circle at a constant speed?

Accepted Answer

Uniform circular motion

Answer

Linear motion

Answer

Projectile motion

Answer

Oscillatory motion

Question 15

Which of the following is a scalar quantity?

Accepted Answer

Mass

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 16

Which of the following is a significant limitation of Newton's Laws of Motion?

Accepted Answer

They are not valid for objects moving close to the speed of light

Answer

They are only valid for objects on Earth

Answer

They do not apply to objects with mass

Question 17

Which of the following physical quantities is a vector?

Accepted Answer

Velocity

Answer

Energy

Answer

Mass

Answer

Speed

Question 18

What is the SI unit for momentum?

Accepted Answer

kilogram meters per second (kg m/s)

Answer

Meters per second (m/s)

Answer

Joules (J)

Answer

Newtons (N)

Question 19

Which of the following is an illustration of a centripetal force?

Accepted Answer

The inward force that keeps a car moving in a circular path

Answer

The downward force that pulls an object towards the ground

Answer

The forward force that pushes an object