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A block A with mass 100 kg is resting on...


A block A with mass 100 kg is resting on another block B of mass 200 kg. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between A and B is 0.2 while coefficient of friction between B and the ground is 0.3. The minimum required force F to start moving B will be

A

900 N

B

200 N

C

1100 N

D

700 N

Text Solution

Verified by Experts

The correct Answer is:
C
(c ) Friction force between block A and block B and between bock B and surface will oppose the F
` therefore F=F_(AB)+F_(BS)`
`=mu_(AB) m_(A)g+ mu _(BS) (m_(A)+m_(B))g`
`=0.2xx100xx10+0.3(100+200)10`
`=200+900=1100N`
This is the required minimum force to move the block B.
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