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A is a 100kg block, and B is a 200kg blo...

A is a 100kg block, and B is a 200kg block. As shown in figure the block A is attached to a string tied to a wall. The coefficient of friction between A and B is 0.2 and the coefficient of fricition between B and floor is 0.3. Then calculate the minimum force required to move the block B.
(take `g=10m//s^(2)`).

Text Solution

Verified by Experts

When B is tied to move, by applying a force F, the frictional forces acting on the block B are `f_(1) and f_(2)` with limiting values, `f_(1)=(mu_(s))_(A)m_(A)gand f_(2)=(mu_(s))_(B)(m_(A)+m_(B))g` the minimum vlaue of F should be (for just tending to move),
`F=f_(1)+f_(2)=0.2xx100g+0.3xx300g=110g=1100N`
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