Physics is the scientific study of natural forces such as sound, light, electricity, heat, pressure, gravity etc. It is all about how things work in our surroundings.
The main objective of physics is to explain how things move in space and time and understand how the universe behaves.
1. Motion
In physics, motion is the change in the position of an object concerning its surroundings in a given interval of time.
Motion can be of two types
a) Translational motion
Body moving in a straight line.
Example- motion of a car in a straight line.
b) Rotational motion
Body moving in a circular path.
Example - circular motion of the wheel of bicycle or motorcycle.
2. Newton's first law
Everybody remains in a state of rest or uniform motion unless acted upon by a net external force.
Example - freely falling body
3. Newton's second law
The amount of acceleration of a body is proportional to the acting force and inversely proportional to the mass of
the body.
Example - Riding a bicycle , the acceleration of your cycle will be directly proportional to the force applied by you on the pedals.
4. Newton's third law
For every action, there is an equal and opposite reaction.
Example - A laptop placed on a table, this will applies a downward force on the table.
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