Physics ยท 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 is/are example of centripetal force?

  1. Roller coaster
  2. Turning of wheels in circular track
  3. Whirling of a stone tied to a string
  4. Rotation of tubes containing a mixture at high speed for precipitation

  1. Both 1 and 2

  2. Only 4

  3. 1, 2 and 3

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

Centripetal force is a force that makes a body to follow a curved path. E.g.

  1. Roller coaster
  2. Turning of wheels in circular track
  3. Whirling of a stone tied to a string Centrifugal force is the apparent outward force that draws a rotating body away from the center of rotation. Rotation of tubes containing a mixture at high speed for precipitation is called centrifugation.
Multiple choice

A kite when flying in the air has _____________.

  1. kinetic energy

  2. potential energy

  3. both potential energy and kinetic energy

  4. neither kinetic energy nor potential energy

  5. kinetic and muscular energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A kite when flying in the air possesses only kinetic energy.

Multiple choice

In a freely falling body, the interchange of energy takes place __________________.

  1. gradually from potential to kinetic energy

  2. gradually from kinetic to potential energy

  3. alternately between potential and kinetic

  4. gradually from chemical to kinetic energy

  5. gradually from potential to chemical energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a freely falling body, the interchange of energy takes place gradually from potential to kinetic energy.

Multiple choice

Pressure is defined as

  1. force acting per unit area

  2. area acting per unit force

  3. product of force and area

  4. product of mass and area

  5. product of mass and gravitational force
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The value of the force acting over per unit area is called pressure.

Multiple choice

Which of the following is not an example of contact force?

  1. Lifting a bucket full of water.

  2. A car moving with the help of a machine.

  3. A fan moving with the help of a motor fitted in it.

  4. A bus and a car colliding with each other.

  5. Falling of a ball or stone thrown towards the sky.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

It is an example of gravitational force, which is a type of action at a distance force.

Multiple choice

The force due to rolling, static and sliding friction in the increasing order is

  1. sliding, static and rolling

  2. rolling, static and sliding

  3. static, sliding and rolling

  4. rolling, sliding and static

  5. static, rolling and sliding
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rolling friction is less than sliding friction and sliding friction is less than and static friction, so less force is needed in rolling friction than sliding friction, and much more force is needed in static friction.

Multiple choice

Spring balance measures the

  1. mass of the body

  2. weight of the body

  3. direction of force applied on a body

  4. direction of motion of a moving body

  5. length of the body
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A spring balance is used to measure the weight of the body, because the weight is the force with which a body gets attracted towards the centre of the earth.

Multiple choice

Frictional force always opposes the motion of one object over another object. On which of the following factors does the friction between two surfaces depend?

a. The amount of surface area of the two objects that is in contact with each other b. Smoothness or roughness of the two surfaces c. The force with which the two surfaces are pressed together

  1. Only a

  2. Only b

  3. Only a and b

  4. Only b and c

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

This is the correct option. The friction between two surfaces depends on the smoothness or roughness of the two surfaces and the force with which the two surfaces are pressed together.

Multiple choice

Arrange the following types of forces in increasing order of their magnitudes:

a. Sliding friction b. Rolling friction c. Static friction

  1. Static friction, rolling friction, sliding friction

  2. Sliding friction, static friction, rolling friction

  3. Rolling friction, sliding friction, static friction

  4. Static friction, sliding friction, rolling friction

  5. Rolling friction, static friction, sliding friction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. Rolling friction is much less than sliding friction. Sliding friction is less than static friction. Thus, the correct increasing order of the forces will be: Rolling friction, sliding friction, static friction.