why is it easier to pull a stone rather than push it

Asked by  | 28th Sep, 2008, 07:41: PM

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.

Answered by  | 29th Sep, 2008, 01:22: AM

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