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Question
In which of the following case(s) is friction a friend?
In which of the following case(s) is friction a friend?
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Solution
The correct option is D Using pen for writing
Friction is called a necessary evil as it has many positive effects. For example, it is because of friction that we are able to walk and write. While writing, the ball inside the pen rolls because of the frictional force acting between the ball and the surface of the paper. Wearing of machines, noise and heat generation are not positive effects of the friction.
Using pen for writing
Friction is called a necessary evil as it has many positive effects. For example, it is because of friction that we are able to walk and write. While writing, the ball inside the pen rolls because of the frictional force acting between the ball and the surface of the paper. Wearing of machines, noise and heat generation are not positive effects of the friction.
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