The document discusses different types of forces including contact forces, non-contact forces, internal forces, and external forces. It defines balanced and unbalanced forces. It explains Newton's First Law of Motion which states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It also discusses the concept of inertia.

1. SHAFNA LATHEEF
PHYSICAL SCIENCE
Reg No: 13982019

2. UNIT : FORCE

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

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

5. INTERNAL FORCE
If 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.

6. EXTERNAL FORCE
If an external force applied on an object .An external
force alone can make an abject to move.

7. 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.

8. 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.

9. 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.

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

11. INERTIA
An object cannot by itself change its state of rest or its uniform
motion in a straight line .This is inertia.

12. A video showing the inertia .