Physics Notes

1. Force and Pressure
Introduction
In daily life, we apply force when we push, pull, lift, or
throw objects. Force can change the shape, size,
direction, or motion of an object.
Force
A force is a push or a pull acting on an object.
Examples:
 Pushing a door
 Pulling a rope
 Kicking a football

Effects of Force
Force can produce the following effects:
1. Change the shape of an object
Example: Squeezing a sponge.
2. Change the speed of an object
Example: Applying brakes slows down a bicycle.
3. Change the direction of motion
Example: A bat hitting a cricket ball.
4. Start or stop motion
Example: Pushing a stationary cart.

, Types of Forces
Contact Forces
These forces act only when objects are in physical
contact.
Examples:
 Muscular force
 Frictional force
Non-Contact Forces
These forces act without physical contact.
Examples:
 Magnetic force
 Gravitational force
 Electrostatic force

Pressure
Pressure is the force applied on a unit area.
Formula:
Pressure = Force / Area
Applications of Pressure
Examples: