Notes seller

Physics
Definition, Branches, Importance, and
Applications
1. Definition of Physics
Physics is a fundamental branch of natural science that studies matter, energy, motion, force,
space, time, and the interactions between them. It explains the basic laws that control natural
phenomena, from the motion of everyday objects to the behavior of atoms and galaxies.

The word Physics comes from the Greek word “physic” meaning nature.

Simple Definition

Physics is the study of matter, energy, and the laws that describe how they interact and
change.




2. What Does Physics Study?
Physics covers many important concepts:

Matter

Matter is anything that has mass and occupies space.

Examples:

 Water
 Air
 Wood
 Iron

Energy

Energy is the capacity to do work or cause change.

, Examples:

 Heat energy
 Light energy
 Electrical energy
 Chemical energy
 Kinetic energy

Motion

Motion is the change in the position of an object with time.

Example: A moving car changes its position with time.

Force

Force is a push or pull that can change the motion or shape of an object.

Examples:

 Gravity
 Friction
 Magnetic force




3. Major Branches of Physics
1. Mechanics
Mechanics is the branch of physics that studies motion, forces, and the effects of forces on
objects.

It includes:

 Motion
 Speed
 Velocity
 Acceleration
 Force
 Momentum
 Work
 Energy

Example: