Presentation on Force and Pressure, CBSE

1. `
Force and Pressure
By-
Riva and Araina

2.  Forces
 What is force ?
 Effects of force
 Types of force
 Quiz

3. • A force is an interaction that causes an
affected object to be pushed or pulled
in a certain direction. This results in an
alteration to the state of the object.
• Whenever force acts, two objects are
involved.
E.g. When we kick a ball, we push it
whereas we need to pull when hitching
a trailer to a car.
What is Force ?

4. KICKING
A
BALL
TUG OF WAR
PULL -UPS OPENING A
DOOR

5. EFFECTS OF FORCE
An object can be in 2 states:
1) Rest state : when the object is not
moving
2) Motion state: when the object is
moving
 A force can move a stationary object. A
force can speed up, decrease the speed
and change the direction of a moving
object . Hence , we can say that force
can change the state of motion.
You can change the shape of a
rubber band and a spring by
stretching it in opposite
directions.
Hence, we can say that forces can
change the shape of an object

6. Types of
forces
Contact forces Non-contacting forces
Muscular forces Friction force
Magnetic force
Electrostatic forces
Gravitational force

7. 1 ) A charged balloon gets attracted to a
wall because of ______:
 Muscular force
 Gravitational force
 Electrostatic force
 Magnetic force
2) An example of a non- contact force is:
 Force exerted by us to lift a bucket
 Push a stationary car
 Force exerted by magnet
 Hit a cricket ball for a 6 run
Quiz !! !

8. 3) If in a tug-o-war, two teams are pulling a rope,
it does not move towards any team, it implies
that :
Equal force is being applied in the same direction
Equal Force is being applied in opposite direction
No force is applied in any direction
Cannot be explained
4)A batsman hits the ball for a boundary past the
bowler that is four runs. The batsman thus :
 Changes the direction & speed of the ball
 Does not change the direction but speed only
 Does not change the speed but direction only
 Does not change either direction or speed

9. Thank
you