1) Force is a push or pull that can change the motion, speed, or shape of an object. It is an interaction between two objects. 2) The effects of force include temporarily or permanently changing an object's shape, changing the direction or speed of motion, and stopping or starting motion. 3) Friction occurs when two surfaces contact each other and can slow motion, cause wear, and improve traction. It is influenced by factors like surface condition and weight.

1. REVATHY R NATHAN
Physical Science

2. SABARIGIRI
COLLEGE OF EDUCATION

4. FORCE
INTRODUCTION
EFFECTS OF FORCE
FRICTION
RELATIONSHIP BETWEEN
FORCE AND PRESSURE

5.  IS A PUSH OR PULL OR BOTH
A force to move an object
away from our bodies
A pull is when we apply a
force to move an object
towards our body
PUSH PULL
Launching
Rocket
Pulling
a box

6. COMBINATION OF PUSH AND PULL
 Playing a guitar
 Sawing wood  Scrubbing the
floor
 Rowing a boat

7. EFECT OF
FORCE
CHANGES THE SHAPE
TEMPORARILY
CHANGES THE SHAPE
PERMANENTLY
CHANGES THE DIRECTION
OF A MOVING OBJECT
CHANGES THE SPEED OF
A MOVING OBJECT
STOPS A MOVING OBJECT
OR MAKES A STATIONARY OBJECT
MOVES

9. CHILDREN’S MISCONCEPTION
A SOLID CANNOT BE COMPRESSED OR STRETCHED
EXPLANATION
THE SHAPE OFA SOLID OBJECT CHANGES WHEN A FORCE IS
APPLIED TO IT WHETHER IT’S TEMPORARIRLY OR
PERMANENTLY
EXAMPLE : CRUSHING A CAN
(CHANGES THE SHAPE
PERMANENTLY)

10. WHEN A FORCE IS APPLIED
IN AN OPPOSITE
DIRECTION (DIFFERENT
DIRECTION) THE APPLYING
OBJECT WILL CHANGE
THE MOVING DIRECTION

11.  A STATIONARY BALL WILL MOVE
WHEN IT IS KICKED
 THE MOVING BALL WILL STOP
WHEN AN EQUAL FORCE IS APPLIED
IN THE OPPOSITE DIRECTION OF
ITS MOTION
 MOVES IN THE SAME DIRECTION
AS IS THE APPLIED FORCE

12. FORCE IS A PROPERTY OF AN OBJECT. AN OBJECT HAS FORCE WHEN
IT RUNS OUT OF FORCE IT STOPS MOVING
EXPLANATION
AN OBJECT AT REST OR IN
MOTION WILL REMAIN IN
THAT STATE
UNLESS AN EXTERNAL FORCE
IS APPLIED TO THE OBJECT
NEWTON 1ST LAW

13. OCCURES WHEN TWO SURFACES ARE MOVING
IN CONTACT WITH EACH OTHER
FACTORS THAT EFFECT FRICTION:
 Physical condition of the surface
 Weight of an object
WAYS TO REDUCE:
 Use ball bearing  Use wheel and axle

14. A D VA N TA G E S :
 Enables people to run and
work without falling or
slipping
 Enables us to write on
paper
 Enables a car to stop when
the brakes are applied
D I S A D VA N TA G E S :
 Slow down a moving
object
 Causes the surfaces of
objects to wear out
 Causes less effectiveness
of moving machine

15. EXAMPLES OF FRICTION

16. RELATIONSHIP BETWEEN FORCE AND PRESSURE
 AIR PRESSURE
PULL AND PUSH
APPLYING
FORCE
 A FORCE IS APPLIED TO THE PUMP
TO PRODUCE AIR PRESSURE