Physics · Science General

Newtonian Mechanics and Forces

1,559 Questions

Newtonian mechanics studies the motion of objects and the physical laws governing them. This hub covers friction, gravitational force, inertia, and vector quantities. Mastering these fundamental physics concepts is essential for various government competitive exams.

Laws of motionFriction and inertiaVector and scalar quantitiesGravitational accelerationArchimedes principle

Newtonian Mechanics and Forces Questions

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

A horse tied to a cart is standing stationary on road. Which of the following statement is CORRECT?

  1. Horse is applying force on the cart

  2. Cart is applying force on the horse

  3. Force applied by the horse is balanced by the force applied by the cart

  4. No forward force is being applied by the horse or the cart
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The horse tied to cart is standing stationary on road denotes that the net force acting on the horse as well as the cart individually is zero. If it is standing stationary, it means that horse is applying force on the road perpendicularly and road is also applying same magnitude of force in the opposite direction, which makes the net force on horse to be zero and hence no forward force on the horse is there.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Which law of Newton defines an ‘inertial frame of reference’?

  1. First law of motion

  2. Second law of motion

  3. Third law of motion

  4. Law of gravitation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

First Law of Newton states that when viewed in an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity unless acted upon by an external force.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Newton's first law of motion is also called Galileo's law of:

  1. Conservation of momentum

  2. Inertia

  3. Friction

  4. Conservation of mass
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Newton's first law of motion states that the object tends to remain in the initial state untill no external force is applied to it which is also called Galileo's law of inertia.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

When a body is stationary :

  1. there is no force acting on it

  2. the combination of forces acting on it balance each other

  3. the force acting on it are not in contact with it

  4. the body is in vacuum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For the body to be stationary, net external force acting on it must be equal to zero which is possible only when the combination of forces acting on it balance each other.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Which law is involved in the act of cleaning a carpet by beating it with a stick ? 

  1. First law of motion.

  2. Second law of motion

  3. Law of conservation of energy

  4. Law of conservation of mass
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dust particles get separated out from the carpet by beating it with a stick due to their inertia of rest which is explained by Newton's first law of motion.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Idea of inertia came from:

  1. Newton's third law of motion

  2. Newton's second law of motion

  3. Newton's first law of motion

  4. Law of gravitation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Newton's first law of motion states that the body tends to remain in the initial state if no external force is applied to it which gave the idea of inertia.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Why is it advised to tie any luggage kept on the roof of a bus with a rope?

  1. While the bus is moving, luggage tends to remain in inertia of motion state

  2. When the bus stops, the luggage tends to resist the change and due to inertia of motion it move forward and may fall off

  3. Both a and b are true

  4. None of them is True
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While the bus is moving, luggage tends to remain in inertia of motion state. When the bus stops, the luggage tends to resist the change and due to inertia of motion it moves forward and may fall off. That's why it is advised to tie any luggage kept on the roof of a bus with a rope.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

The law that gives a qualitative definition of force is :

  1. Newton's second law of motion

  2. Law of inertia

  3. Newton's third law of motion

  4. Law of gravitation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Law of inertia states that the body tends to remain in the same state (regarding its velocity and direction) untill no external force is acting on it.

Hence option B is correct.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Which of the following equations or principle is most suitable to solve given question.  

A block of mass $m$ remains at rest on a table when a piece of paper is pulled out from under it.

  1. Newton's first law(law of inertia)
  2. Newton's second law ($F _{net}$ = ma)

  3. Newton's third law (For every action there is an equal and opposite reaction)

  4. Newton's law of universal gravitation

  5. Conservation of linear momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Newton's First Law of Motion - sometimes referred to as the law of inertia states that 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.

Hence a piece of mass remains at rest on a table when a piece of paper is suddenly pulled out from under it.

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

If no force acts on a body, then what will happen to it?

  1. It does not change its shape.

  2. It continues to move but with less speed.

  3. It changes its direction.

  4. It can either remain at rest or continue to move in a straight line.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The force is define as $F=ma$
hence acceleration is $a=\dfrac{F}{m}$
if  balanced force acts on a body F is  zero hence body must not be accelerated. hence by eq of motion $u=v=at,a=0\implies u=v$ if v=0,u=0
It can either remain at rest or continue to move in a straight line.
Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

Physical independence of force is a con-sequence of 'X'. Identify 'X'.

  1. Newton's third law of motion

  2. Newton's second law of motion

  3. Newton's first law of motion

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Physical independence of force is a con-sequence of 'X'.

X is Newton's first law of motion Newton's first law of motion - sometimes referred to as the law of inertia. 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

Multiple choice physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

When a bus suddenly takes a turn, the passengers are thrown outwards because of 

  1. Inertia of motion

  2. Acceleration of motion

  3. Speed of motion

  4. Both (b) and (c)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to law of inertia of motion a body will continue moving with constant velocity until unless any force is acting on it. When a bus is moving straight the passengers inside are also moving straight but when suddenly bus turn left passengers still continue to move straight  because no force is acting on passengers so they will move with same magnitude and direction i.e. outwards when bus turns .