# Need help with inclined plane problem

1. Nov 2, 2004

### tricky_tick

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Last edited: Nov 2, 2004
2. Nov 2, 2004

### siddharth

Work is Force X Displacement. Now Work is minimum when the net force is minimum
By drawing the Free Body Diagram for the block, you would arrive at
$$0=ma=F - mg \sin \alpha - \mu mg \cos \alpha$$
Differentiating F with respect to alpha and equating to zero you would get the required result