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 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

Video

 

A fielder catches the ball

Cricker catching the ball.gif

 

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

A footballer kicking a ball

kicking a football.gif



A person playing golf hits a ball

Golf ball stopping itself.gif

 

Force can change direction of object

A batsman hitting a ball

Bowler bowls ball at the batsman

Batsman hits it in different direction

PowerlessNearCaudata-size_restricted.gif



A footballer passes ball to another footballer

WorldCup.gif

 

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,while rolling chapati with a rolling pin(Belan) we apply force on the dough which changes its shape.

Making roti.gif

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-GIF-mint_grande.gif

 

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

CA Maninder Singh's photo - Expert in Practical Accounts, Taxation and Efiling
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 9 years and a teacher from the past 16 years. He teaches Spoken English, Written English, Grammar and Vocabulary at Englishtan.