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Mechanics

Scorching goIITian

 Joined: 27 Aug 2008 Post: 201
7 Nov 2008 19:14:52 IST
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6
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laws of motion
Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Mechanics

1)A monkey of mass 20kg is holdingt a vertical rope ,which breaks under a weight of 25kg.The max accln with which the monkey can climb up the rope is(g=10m/s^)

2)Frictional force b/w 2 surfaces is max for

1)sliding fr

2)rolling fr

3)static fr

4)limiting fr

Scorching goIITian

Joined: 27 Aug 2008
Posts: 201
7 Nov 2008 19:28:30 IST
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Cool goIITian

Joined: 21 Sep 2008
Posts: 55
7 Nov 2008 19:30:54 IST
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Moderator
Joined: 16 Dec 2006
Posts: 3373
7 Nov 2008 19:36:38 IST
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1) 25g = m (g+a)
250 = 20 (10 + a)
a = 2.5 m/s^2

2) limiting friction is maximum

Scorching goIITian

Joined: 27 Aug 2008
Posts: 201
7 Nov 2008 19:42:21 IST
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can u pls give reason for my 2 Q?

Cool goIITian

Joined: 21 Sep 2008
Posts: 55
7 Nov 2008 19:47:27 IST
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Limiting friction is that friction if you exceed it then it converts to kinetic friction and body starts moving.So it is maximum.

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Joined: 16 Dec 2006
Posts: 3373
7 Nov 2008 19:58:05 IST
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max value of static friction is limiting friction and just beyond that, motion starts, and kinetic friction is less than it. Experimentally observed.

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