Generally, force can bring
- Change in state of motion
- Change in shape
Let’s learn both
Force and State of Motion
What is state of motion?
It is the speed and direction of object.
If an object is moving ,it is in state of motion
If a person is not moving,it is at rest (in zero state of motion)
Hence, objects which are moving and which are not moving are both in state of motion
How does Force bring change in state of motion
- Force can make Moving Objects Stationary(It can stop moving objects)
- Force can Move Stationary Objects (It can cause objects to move)
- Force can change direction of object
Force can make Moving Objects Stationary
A goalkeeper drives to stop the ball
A fielder catches the ball
Force can Move Stationary Objects (It can cause objects to move)
A footballer kicking a ball
A person playing golf hits a ball
Force can change direction of object
A batsman hitting a ball
Bowler bowls ball at the batsman
Batsman hits it in different direction
A footballer passes ball to another footballer
Sometimes,there is no change in state of motion due to force
If we push a heavy rock, it does not move
This is because our force is of less magnitude (size of our force is less)
Force can Change shape of Object
We can change shape of object by exerting force (putting force)
Example 1-Making chapati from dough
When we use dough for making chapatis, when we press the dough with our hands we apply force on the dough which changes its shape.
Example 2-Squeezing Toothpaste
When we squeeze the toothpaste tube,its shape changes
This is because we apply force on the tube while squeezing it.
NCERT Question 2 - Give two examples of situations in which applied force causes a change in the shape of an object.
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