#### jimmy p

Gold Member

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A solid uniform cube of side 4cm and weight 60N is situated on a rough horizontal plane. The coefficient of friction between the cube and the plane is 0.4. A force, P, acts in the middle of one of the edges of the top of the cube, at right angles to it and at angle

*theta*to the upward vertical.

In the cses when the value

*theta*is (a) 60 degrees (b) 80 degrees, find

(i) the force P needed to make the cube slide, assuming it does not topple;

(ii) the force P needed to make the cube topple, assuming it does not slide.

So I have tried many variations using sin, cos and tan but cannot seem to get the right answer. Can someone tell me the formula so i can work these out for myself?