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`        A 8 kg block is at rest on a horizontal floor. If you push horizontally  on the 8 kg block with a force of 20 N, it just starts to move.   (a) What is the coefficient of static friction?   (b) A 10.0 kg block is stacked on top of the 8 kg block. What is the  magnitude F of the force, acting horizontally on the 8 kg block as  before, that is required to make the two blocks start to move?`
7 years ago

510 Points
```										ans a)if the block just starts moving then static friction force is equal to the applied force
friction force=F (applied force)
u.N =20    (here N is normal reaction =mg=80N)
u=20/80=.25
ans b) F(min)=static friction force
=u.N             (N=mg =180N)
=0.25*180=45N
```
7 years ago
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