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

Which of the following is a vector quantity?

  1. Momentum

  2. Pressure

  3. Energy

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

Momentum is a vector quantity because it is the product of mass (scalar) and velocity (vector), giving it both magnitude and direction. Pressure, energy, and work are all scalar quantities.

Multiple choice

Which of the following statements is/are false?

(1) Power is the amount of work done in a unit of time and its unit is watt/sec. (2) A force is said to do work when it acts on a body and causes displacement. (3) Energy refers to the capacity to do work.

  1. Only (1)

  2. Only (2)

  3. Only (2) and (3)

  4. Neither of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement (1) is incorrect. Power is the amount of work done in a unit of time. Hence, its unit is Watt = J/s.  Statement (2) is correct. Work is always related to the displacement of body in the action of applied force. Statement (3) is correct. ‘Energy’ refers to the capacity to do work.

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.