VARSHA .B ZMCTE

1. FORCE AND LAWS OF
MOTION
Submitted by: Varsha.B
Physical science
Roll no: 14

2.  A push or pull on a body is called force.
Forces are used in our everyday actions like
pushing, pulling, lifting, stretching, twisting
and pressing.
FORCE

3. EFFECTS OF FORCE
 A force cannot be seen. A force can be judged only
by the effects which it can produce in various
bodies around us.
 A force can move a stationary body.
 A force can stop a moving body.
 A force can change the speed of a moving body.
 A force can change the direction of a moving body.
 A force can change the shape and size of a body.

4. BALANCED AND UNBALANCED FORCE
There are two kinds of force:
 Balanced force
 Unbalanced force

5. BALANCED FORCES
If the result of all the forces acting on a body is zero,
the forces are called balanced forces.
 If a number of balanced forces act on a stationary
body the body continuous to remain in its stationary
position.
 If a number of balanced forces act on a body in
uniform motion, the body continuous to be in its
state of uniform motion.
 Though balanced forces cannot produce motion in
a stationary body but can change the shape of the
body.

6. UNBALANCED FORCES
If the resultant of all the forces acting on a body is not
zero, the forces are called unbalanced forces.
 When an unbalanced force acts on a body, it
produces motion in the body. Also an unbalanced
can stop a moving body.
 If there were no unbalanced force of friction or air
resistance, a moving body would go on forever.

7. MOTION
Newton has given three laws to define the
motion of bodies. These laws are known
as Newton’s laws of motion.

8. NEWTON’S FIRST LAW OF MOTION
A body at rest remain in rest, and a body
in motion will continue in motion in a
straight line with uniform speed, unless
it is compelled by an external force to
change its state of rest or of uniform
motion.

9. MOMENTUM
The momentum of a body is defined as the
product of its mass and velocity.
Momentum = mass velocity
p = m v
Where p = momentum
m = mass of the body
v = speed of the body

10. NEWTON’S SECOND LAW OF MOTION
The rate of change of momentum of a
body is directly proportional to applied
force, and takes place in the direction in
which force acts.
Force = change in momentum / time taken
and
Force = mass acceleration.

11. NEWTON’S THIRD LAW OF MOTION
Whenever one body exerts a force on
another body, the second body exerts
equal and opposite force to the first body
OR
To every action there is equal and
opposite reaction.
Eg: The rocket works on the principal of
action and reaction.

12. LAW OF CONSERVATION OF
MOMENTUM
When two or more bodies act upon one
another, their total momentum remains
constant provided no external forces are
acting.
Momentum is neither be created nor be
destroyed.

13. Thank you
THANK YOU