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

Which of the following theorems states that the work done by a force acting on the body during its displacement is equal to the change in kinetic energy of the body during displacement?

  1. Law of conservation of momentum

  2. Cauchy's theorem

  3. Work energy theorem

  4. Pythagoras theorem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Work energy theorem states that the work done by a force acting on the body during its displacement is equal to the change in kinetic energy of the body during displacement.

Multiple choice

Which of the following laws states that everybody continues in its state of rest or of uniform motion along a straight line unless it is compelled by an external force to change that state?

  1. Newsland's law

  2. Periodic motion law

  3. Newton's first law of motion

  4. Bernoulli law
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Newton's first law of motion states that everybody continues in its state of rest or of uniform motion along a straight line unless it is compelled by an external force to.change that state.

Multiple choice

If the work done by a force in moving a body between two positions is independent of the path followed by the body then, such type of force is called which of the following?

  1. Conservative force

  2. Power

  3. Strong nuclear force

  4. Electromagnetic force
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If the work done by a force in moving a body between two positions is independent of the path followed by the body, then such type of force is called conservative force.

Multiple choice

Which of the following laws states that if a body or system of bodies is in motion under a conservative system of forces then the sum of its kinetic energy and potential energy is constant?

  1. Law of conservation of momentum

  2. Einstein law

  3. Bernoulli law

  4. Law of conservation of energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Law of conservation of energy states that if a body or system of bodies is in motion under a conservative system of forces then the sum of its kinetic energy and potential energy is constant.

Multiple choice

A porter is pushing a big suitcase on the ground from north to south direction. The force of friction due to ground will act on this big suitcase towards ______.

  1. west direction

  2. east direction

  3. south direction

  4. north direction

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. The force of friction due to ground will act on this big suitcase towards north direction if the porter is pushing the big suitcase from north to south direction.

Multiple choice

Which of the following can be measured with a spring balance?

a. Weight of an object b. Density of an object c. Mass of an object d. Force acting on an object

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only b and d

  5. Only a and d
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. When a spring balance is held vertically, it is said to measure the weight of an object. And when a spring balance is held horizontally, it is used to measure the force acting on an object.

Multiple choice

Which of the following statements is/are false?

a. The interlocking of irregularities of the two surfaces opposes the motion of one object over the other and gives rise to force of friction. b. Vehicles are able to move on road because of the presence of friction between their tyres and the surface of road. c. Cars and speedboats are streamlined to increase drag.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. Cars and speedboats are streamlined to reduce drag.

Multiple choice

The force required to keep an object in a circular motion is known as

  1. circular force

  2. centrifugal force

  3. centripetal force

  4. gravitational force
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Centripetal force is the inward force required to keep an object moving in a circular path. It acts toward the center of the circle and is necessary because objects in motion tend to move in straight lines (Newton's first law). Without centripetal force (provided by tension, gravity, friction, etc.), an object would fly off tangentially. Centrifugal force is a fictitious outward force observed in a rotating reference frame.