Question

Suppose the you push with a 40N horizontal force on a 4KG mass resting on a horizontal surface against a horizontal friction force of 24N.

Answer 1

Answer:

As the block B, together with block A is laying on rough surface with u=0.5(u is not the initial velocity it is mu) it will be able to accelerate if the applied force is greater than u(mA+mB)g=0.5(10)(10)=50N.

Hence the force applied is only 25N .hence there will be no acceleration and frictional force between A & B will not arise .

force between A and B is zero.