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

  1. Force can make Moving Objects Stationary(It can stop moving objects)
  2. Force can Move Stationary Objects (It can cause objects to move)
  3. Force can change direction of object

 

Force can make Moving Objects Stationary

A goalkeeper drives to stop the ball

Goalkeeper Catches the ball.jpg

 

A fielder catches the ball

Cricketer catching the ball

 

 

Force can Move Stationary Objects (It can cause objects to move)

A footballer kicking a ball

Kicking a football



A person playing golf hits a ball

Golf ball stopping itself

 

Force can change direction of object

A batsman hitting a ball

Bowler bowls ball at the batsman

Batsman hits it in different direction

Changing the direction of ball



A footballer passes ball to another footballer

World Cup

 

Note

Sometimes,there is no change in state of motion due to force

Example

If we push a heavy rock, it does not move

push a heavy rock.jpg

 

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.

Making Roti

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.

Hand Squeezing Toothpaste

 

Questions

NCERT Question 2 - Give two examples of situations in which applied force causes a change in the shape of an object.

View Answer

 

  1. Class 8
  2. Chapter 11 Class 8 - Force And Pressure

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.