SHAFNA LATHEEFPHYSICAL SCIENCEReg No: 13982019

UNIT : FORCE

1. Contact Force

A force that can be applied only when it is in contact with an object is called contact force.

Non- contact force

A Force that can be applied without any contact between two bodies is called non – contact force

INTERNAL FORCEIf an internal force applied on an object the

object does not move.A slide showing the picture of internal

force .A person sit in a chair and lift the chair with out letting your legs touch the floor.

EXTERNAL FORCEIf an external force applied on an object .An

external force alone can make an abject to move.

BALANCED FORCE:When a number of force act on a

body ,and the resultant of these force is zero, then the force is said to Balanced force.

UNBALANCED FORCE

When a number of force act on a body the resultant force is not zero, the force are said to be unbalanced force.

NEWTON’S FIRST LAW

Anybody continue to be in a state of rest or of uniform motion in a straight line until a unbalanced external force is applied on it .This is Newton’s first law of motion.

A person wear seat belt is compulsory for those who travelled in the front seat of a car

INERTIAAn object cannot by itself change its state of rest or its

uniform motion in a straight line .This is inertia.

A video showing the inertia .