Home » Ask & Discuss » Physics
« Back to Discussion

Mechanics

Cool goIITian

Joined:	19 Apr 2012
Post:	53

24 May 2012 03:42:18 IST

2 People liked this

268

Rotational Motion Friction Work

Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Mechanics , Kinematics , NewtonsLawsCirMotion , Work Power Energy collisions , Rotation , Gravitation , Simple Harmonic Motion , Fluid Mechanics , Materials Wave Sound , Super Position , units dimensions , com momentum , shm , wave sound

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

Comments (4)

GOPAKUMAR

Scorching goIITian

Joined: 18 Mar 2010

Posts: 278

24 May 2012 08:20:25 IST

Like 1 people liked this

d) W > mgh - Fl

Shantanu Gontia

Cool goIITian

Joined: 19 Apr 2012

Posts: 53

24 May 2012 09:30:57 IST

Like 0 people liked this

oh forgot to mention ..this is a multiple answers correct type.

GOPAKUMAR

Scorching goIITian

Joined: 18 Mar 2010

Posts: 278

24 May 2012 10:10:13 IST

Like 1 people liked this

Ans is d) W > mgh - Fl

Krishna Gopal Singh

Forum Expert

Joined: 29 Dec 2006

Posts: 5524

24 May 2012 19:58:34 IST

Like 0 people liked this

IN CASE OF NO SLIP. WORK OF FRICTION IS ZERO. Hence W> mgh-Fl

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team