It is easier to pull a roller than to push it. Why? Explain.

It is easier to pull a roller than to push it. Why?

Posted by: - Mike
Posting Time: - 7/17/2015 1:13:08 AM
Subject: - Physics

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Best 5 Answers:-

Answer by:- Benette

Let’s see the free body diagram of the roller in both push and pull :

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When we push, the vertical component of the applied force is downwards and increases the value of normal reaction, and hence the friction.
f = mu*(mg + Fsin(theta) )
But while we pull the roller, the vertical component of the applied force is upward and decreases the normal reaction, and hence the friction.
f = (mg - Fsin(theta) )
And we know that the lesser the friction easier to move the roller (as the friction acts in opposite to the motion).

 
   

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