02. What is Force?

I. Definition of Force

• Force is a push or pull exerted by one object on another.

II. Effects of Force

1. Change in speed (acceleration or deceleration):

   • Example: A player kicks a motionless ball, causing it to move.

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2. Change in shape (deformation):

   • Example: A ball hitting a wall gets deformed.

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III. Classification of Forces

1. Contact Force:

   • Appears when two objects are in physical contact.

   • Example: Pushing a door open with your hand.

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2. Non-contact Force:

   • Appears even when objects are not in direct contact.

   • Example: A magnet attracting an iron ball.

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