E. Give reasons for the following.
1. If we kick a football, it comes to rest after moving for sometime.
2. Wheels of vehicles are made circular in shape.
3.The players sprinkle fine powder on the carrom board before they start playing.
4. The jar of a mixer becomes hot when it is run for few minutes.
5. It is easier to move the box that is already in motion than to move it from rest.
Answers
Given : Different statements
To Find : Reason
Solution:
1. If we kick a football, it comes to rest after moving for sometime.
This happens because of friction .
Frictional forces opposes the motion and gradually football comes to rest.
2. Wheels of vehicles are made circular in shape.
As circular shape takes least surface area hence minimum frictional force
thats why vehicles are made circular in shape.
3.The players sprinkle fine powder on the carrom board before they start playing.
To Reduce Friction
4. The jar of a mixer becomes hot when it is run for few minutes.
Because of Friction between bodies
5. It is easier to move the box that is already in motion than to move it from rest.
As Static Friction is more than kinetic friction .
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Answer:
1.this happens because of a phenomenon that opposes or resist the motion of the football or the cycle over the ground