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

If a cell from canon bursts in the air, the total kinetic energy

  1. increases

  2. decreases

  3. remains constant

  4. may increase or decrease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a balloon bursts, the stored elastic potential energy converts to kinetic energy of the rubber fragments and air. The total kinetic energy increases as potential energy decreases, conserving total energy.

Multiple choice

Rocket works on the principle of ___________.

  1. Conservation of energy

  2. Conservation of momentum

  3. Conservation of mass

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

Rockets operate based on Newton's third law of motion, which is a direct application of the law of conservation of momentum. Expelling gas at high speed in one direction creates an equal and opposite force that propels the rocket forward.

Multiple choice

If horse starts suddenly, the rider may fall due to the _________.

  1. moment of inertia

  2. law of conservation of the mass

  3. inertia of rest

  4. third law of motion

  5. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a horse starts suddenly, the lower part of the rider's body moves with the horse, but the upper part remains at rest due to inertia of rest, causing the rider to fall backward.

Multiple choice

If two bodies one heavy and one light are acted upon by the same force for the same time, then both bodies acquire the

  1. Same velocity

  2. Same momentum

  3. Same acceleration

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

According to Newton's second law, force is the rate of change of momentum (F = dp/dt). When the same force acts on two different bodies for the same time interval, the impulse applied to both is identical, resulting in both bodies acquiring the same momentum.

Multiple choice

The passengers in a boat are not allowed to stand because

  1. This will raise centre of gravity of system and the boat will be rocked

  2. This will lower center of gravity and the boat will be rocked

  3. The effective weight of system increases

  4. Of surface tension effects
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Standing up raises the center of gravity of the passenger-boat system. A higher center of gravity makes the system less stable and more prone to tipping or rocking.

Multiple choice

When milk is churned, the cream is separated due to …………

  1. Centrifugal force

  2. Centripetal force

  3. gravitational force

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

Cream is separated from milk during churning due to centrifugal force, which pushes the denser components of the milk outward, allowing the lighter fat globules (cream) to collect in the center.

Multiple choice

A force has

  1. Both magnitude and direction

  2. Only magnitude

  3. Only direction

  4. Neither magnitude nor direction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A force is a vector quantity therefore it has both direction as well as magnitude.