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Mechanics

Cool goIITian

 Joined: 19 Apr 2012 Post: 53
24 May 2012 03:42:18 IST
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Rotational Motion Friction Work
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A solid sphere starts from rest at the top of an incline of height h and length l and moves down. The force of friction between the sphere and the incline is F. It is sufficient to prevent sliping. The Kinetic Energy of the sphere at the bottom of the incline is W then

a) The work done against the force of friction is Fl

b) the heat is produced is Fl

c) W = mgh-Fl

d) W > mgh - Fl

Scorching goIITian

Joined: 18 Mar 2010
Posts: 278
24 May 2012 08:20:25 IST
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d) W > mgh - Fl

Cool goIITian

Joined: 19 Apr 2012
Posts: 53
24 May 2012 09:30:57 IST
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oh forgot to mention ..this is a multiple answers correct type.

Scorching goIITian

Joined: 18 Mar 2010
Posts: 278
24 May 2012 10:10:13 IST
1 people liked this

Ans is d) W > mgh - Fl

Forum Expert
Joined: 29 Dec 2006
Posts: 5524
24 May 2012 19:58:34 IST
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IN CASE OF NO SLIP. WORK OF FRICTION IS ZERO. Hence W> mgh-Fl

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