Physics · Science General

Newtonian Mechanics and Forces

1,605 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

Every body continues to be in its state of rest or of non-uniform motion in a straight line unless compelled by some external force to act otherwise. This is stated by:

  1. Newton's 1st law

  2. Newton's 2nd law

  3. Newton's 3rd law

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The premise of question is external force is zero and conclusion is  state of motion of body will be at rest or non uniform motion. However, the non uniform motion is only applicable in case of external force being applied to body, hence the statement is false.

So, given statement is stated by none of Newton's laws.

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 there are many forces acting on an object, it must have a non-zero net (unbalanced) force acting on it.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In case of many forces acting on the body, it can be in equilibrium,which implies zero external force. For example in case of ladder supported by a wall there are frictional and gravitational forces working at wall and floor, which balances each other so that ladder does not move. Hence the given statement is false.

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

Consider a ball at rest in the middle of a toy wagon. When the wagon is pulled forward, the ball:

  1. Rolls forward

  2. Stays stationary

  3. Rolls sidewards

  4. Rolls backwards
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The relative motion between ball and toy wagon is zero before being pulled. As the wagon is pulled, the inertia of ball causes ball to maintain its state of rest, so the ball rolls backwards when wagon is moved in forward direction.

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

It is advised to tie any luggage kept on the roof of a bus with a rope because of :

  1. Newtons first law

  2. Newtons second law

  3. Newtons third law

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Luggage kept on the roof of a bus has the tendency to maintain its state of rest when bus is in rest and to maintain the state of motion when bus is in motion according to Newtons First Law of Motion. When bus will come in motion from its state of rest, in order to maintain the position of rest, luggage kept over its roof may fall down(backward). Similarly, when a moving bus will come in the state of rest or there is any sudden change in velocity because of applying of brake, luggage may fall down(forward) because of its tendency to remain in the state of motion.
This is the cause that it is advised to tie any luggage kept on the roof a bus with a rope so that luggage can be prevented from falling down.

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

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.