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CBSE Class 11-science Answered

Why the door cannot be rotated by applying force in a direction parallel to the plank of the door?
Asked by Topperlearning User | 12 Aug, 2014, 02:09: PM
answered-by-expert Expert Answer

We know that

= r Fsin Φ     ----------------------------------------(1)

When, force is applied in a direction parallel to.

 Φ = 0° or 180°

Therefore sin Φ=0

Substituting in eq(1), we get

Torque () = 0

Therefore, Torque of the force is zero. So, the door cannot be rotated by applying force in a direction parallel to the plank of the door.       

Answered by | 12 Aug, 2014, 04:09: PM
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