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We studied Force previously as a push and pull on the body
But that is an incorrect definition.
To correct it, first lets study what force can do
Different Effects of Force
Force can
- Move stationary object
- Stop moving object
- Change speed of the object
- Change direction of a moving body
- Change shape of a body
Force can move stationary object
A footballer kicking a ball
Force can stop moving object (Make Moving Object Stationary)
A fielder catches the ball
Force can change speed of moving body
A footballer passes ball to another footballer
Force can change direction of moving body
A batsman hitting a ball
Force can change shape of an object
We can change shape of object by exerting force (putting force)
So, we see that the push and pull definition of force is wrong. Let's look at a new definition
Definition of Force
We can also define force as something which can
Move a stationary object or
Make moving object stationary or
Change speed,direction, shape or size of moving body
Questions
Q 2 Page 118
- In the following example, try to identify the number of times the velocity of the ball changes:
“A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team”.
Also identify the agent supplying the force in each case.
