Class8 Science Book Curiosity Chapter5 QA

By dk -

Chapter 5 – Exploring Forces

VERY SHORT ANSWER (1 MARK) – IMPORTANT

  1. What is a force?
    A push or pull acting on an object.

  2. What can a force do?
    It can change shape, speed, direction or state of motion.

  3. Name two types of forces.
    Contact force and non-contact force.

  4. What is contact force?
    Force that acts only when objects touch.

  5. What is non-contact force?
    Force that acts without physical contact.

  6. Name one contact force.
    Friction.

  7. Name one non-contact force.
    Gravitational force.

SHORT ANSWER (2 MARKS) – IMPORTANT

  1. Define force.
    Force is a push or pull that can change the shape, motion or direction of an object.

  2. What are contact forces? Give examples.
    Forces that act when objects are in contact.
    Examples: Friction, muscular force.

  3. What are non-contact forces? Give examples.
    Forces that act without contact.
    Examples: Gravitational, magnetic force.

  4. What is friction?
    Friction is a force that opposes motion between two surfaces in contact.

  5. Why is friction useful?
    It helps us to walk, write and hold objects.

  6. What is gravitational force?
    The force by which Earth attracts objects towards its centre.

LONG ANSWER (5 MARKS) – IMPORTANT

1. Explain different types of forces.

Forces are of two types:

  1. Contact forces – Act when objects touch (muscular force, friction).
  2. Non-contact forces – Act without contact (gravitational, magnetic force).

2. Explain effects of force.

A force can:

  • Change shape of an object
  • Change speed of an object
  • Change direction of motion
  • Start or stop motion

3. What is friction? Explain its advantages and disadvantages.

Friction is a force that opposes motion between two surfaces in contact.

Advantages:

  • Helps in walking
  • Enables writing
  • Helps vehicles move

Disadvantages:

  • Causes wear and tear
  • Produces heat
  • Reduces efficiency of machines

4. Explain gravitational force.

Gravitational force is the force by which Earth attracts objects towards itself.
It causes objects to fall towards the ground.


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