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

A boy was travelling for the first time in an aeroplane. As the flight took off from the airport, he got an uneasy feeling. He felt that some pressure changes had occurred. What forces were acting on the aeroplane immediately after it took off?

  1. Magnetism and muscular force

  2. Electrostatic force and magnetism

  3. Friction of fuel and muscular force

  4. Gravity and friction of air

  5. Magnetism and mechanical force
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gravity and friction of air were acting on the aeroplane immediately after it took off.

Multiple choice

Which of the following is an example for muscular force?

  1. Blacksmith hammering a hot piece of iron

  2. Magnet attracting an iron piece

  3. An apple falling from a tree

  4. A rolling ball coming to rest

  5. An aircraft taking off
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blacksmith uses his muscular force to hammer a hot piece of iron.

Multiple choice

Which of the following relationship is true?

  1. Effort * distance moved by effort = Load * distance moved by load.

  2. Effort * distance moved by effort > Load * distance moved by load

  3. Effort * distance moved by effort < Load * distance moved by load

  4. Effort / distance moved by effort = Load * distance moved by load

  5. Effort * distance moved by effort = Load / distance moved by load
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the right equation.

Multiple choice

Which of the following statement is false about a pulley?

  1. Force is applied towards gravity

  2. Direction of force can be changed

  3. It is neither a speed multiplier nor a force multiplier

  4. Wheel is fixed over the axle

  5. It is used to lift heavy objects
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is wrong because wheel is not fixed but rotates freely over the axle.

Multiple choice

Which of the following is not a negative effect of friction?

  1. A child is able to write with a pencil.

  2. Worn out soles in an old shoe

  3. Wearing out of tyres of vehicles

  4. Ball bearing in a machine wearing out

  5. Machine working for a long time producing too much heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Writing with a pencil or pen will not be possible without friction.

Multiple choice

Which of the following statements is incorrect?

  1. Friction is a necessary evil.

  2. Friction cannot be reduced.

  3. Static friction comes into play when we try to move an object at rest.

  4. Rolling friction is always less than sliding friction.

  5. Friction is caused due to interlocking of irregularities on the two surfaces in contact with each other.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Friction can be reduced by using lubricants, soap solution or by polishing, etc.

Multiple choice

Which of the following forces can act from a distance?

  1. Chemical and Electrical forces

  2. Gravitational and Magnetic forces

  3. Mechanical and Elastic forces

  4. Friction and Hydrostatic forces
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solution: Forces can be categorized as contact and non-contact forces. The examples of non- contact forces are Gravitational, magnetic, electrostatic, etc. The examples of contact forces are friction, chemical, electrical, etc.

Multiple choice

The centre of mass of a body depends upon which of the following factors?

  1. Size of the body
  2. Shape of the body
  3. Position of the body

  1. Only 1

  2. Only 1 and 3

  3. Only 2

  4. Only 1, 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The centre of mass of a rigid body is a point whose position is fixed with respect to the body as a whole. The point may or may not lie in the body. The position of the centre of mass of a rigid body depends on the following:

(1) Shape of the body (2) Distribution of mass in the body

Multiple choice

Which of the following statements about motion is incorrect?

  1. A body moving with uniform speed can have non uniform velocity.

  2. A body moving with uniform acceleration can be at rest at an instant.

  3. An accelerating body may move with constant speed.

  4. A body moving with constant velocity can have varying speed.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Solution: A body can have a constant speed but a changing velocity because the direction can change while the speed is constant.

Multiple choice

Consider the following statements:

  1. When we jump out from a boat standing in water, it moves forwards.
  2. Weight of a body is lesser in plains and greater on hilltops.

Which of the given statements is/are incorrect?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement 1 is incorrect. The action being you jumping imparts an equal force on the boat pushing it backwards with only drag to resist its motion. Statement 2 is also incorrect. Weight of a body is greater in plains and lesser on hilltops.

Multiple choice

Consider the following statements:

  1. When a bomb is thrown from an aeroplane, it will follow a straight path.
  2. Work done by a body in circular motion is zero.

Which of the given statements is/are correct?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1 is incorrect. When a bomb is thrown from an aeroplane, it will follow a hyperbolic path. Statement 2 is correct. Work done by a body in a circular motion is zero, because the force applied and displacement makes the angle of 900.