four effects of force with an example
Answers
If the resultant force is zero the forces on the object are balanced.
If the resultant force acting on the object is ‘zero’ then: the object will remain stationary. In such a case the object will move at a steady speed in a straight line.
If the resultant force acting on the object isn’t zero then: the object will either accelerate or decelerate.
Solved Example For You
Q. When a football is kicked, its shape changes for a fraction of a second. This is because:
a. force changes the shape of an object
b. force does not change the shape of an object
c. momentum changes the shape of an object
d. motion changes the shape of an object
Sol: a. force changes the shape of an object
Force changes the shape of an object. When a football is kicked, a contact force is applied and thus its shape changes.
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Answer:
1. A force can make a stationary body move or can increase the speed of a moving body.
For example -
Suppose you are pushing a table in your classroom. What happens to the table? The table starts moving in the direction of the force applied. Thus, we can say that a force can set a a body from rest to motion. If you a trolley, it moves. If you push it harder, it will move faster with a greater speed.
2. A force can make a moving body stop.
For example -
Have you seen a fielder in a cricket match stretching out his arms to catch the ball from crossing the boundary? What does he actually do? He applies force with his hands to stop the ball from going further. Thus, we can say that force can make a moving body slow down or stop.
3. A force can change the direction of a moving body.
For example -
Consider a moving cricket ball hit by a batsman. The batsman hits the ball and changes the direction of motion of the ball. You must have watched a soccer match. Each player in both the teams tries to bring the ball towards their goal post. If a member of one team kicks the ball in one direction, a player of the opponent team kicks it in the the other direction. Here, they are actually applying force to change the direction of the moving ball. This shows that force can change the direction of a moving body.
4. A force can change the shape of a body.
For example -
Hold a rubber ball in your hands and press it between both of your hands. What happens to the shape of the ball? The shape of the ball changes. Have you seen your mother making chapattis? She kneads the dough with her hands. Every time she presses into the dough, it changes its shape. Thus, we can say that force can change the shape of the body.