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ICSE Class 9 Answered

<ol> <li>Which of the two push or pull is easier?Give reason for your answer?</li> <li>Give an example each of pull and push which do not produce any major change in the shape size of a body?</li> </ol>
Asked by lakhwindersaggu2 | 13 Aug, 2016, 11:19: AM
Expert Answer

It is easy to pull than to push.

When we push or pull with a force F at angle θ with horizontal , the force of push or pull can be resolved into two rectangular components :

1. F cosθ , the horizontal component which helps it to move in forward direction.

2. F sinθ , the vertical component of force.

In case of pull , F sinθ acts in vertically upward direction which decreases the normal reaction and hence force of friction decreases .

In case of push , F sinθ  acts in vertically downward direction which increases the normal reaction and hence force of friction increases.

As in case of pull, force of friction is less than that in case of push. Hence it is easy  to pull than to push.

Example: Push: Pushing a wall will not change the size or shape of the wall.
                Pull : Pulling a locked door.
Answered by Yashvanti Jain | 16 Aug, 2016, 11:11: AM
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