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nab_

- 13

- 1

- Homework Statement
- A block rests on a slope which is angled at θ° to the horizontal. The coefficient of friction between the surface of the slope and the block is tan α. P1 is the horizontal force that needs to be applied to the block to stop it from slipping down the slope, whilst P2 is the greatest horizontal force that can be applied without the block slipping up the slope. Show that P2/P1= (tan(θ + α))/(tan(θ - α))

- Relevant Equations
- F= μR

The best I could do was draw a forces diagram. I know that friction would be working up when the block is on the point of slipping down the plane and friction will be acting down the slope against the direction of motion when the block is on the point of slipping up the slope. (not even sure if I have that right at this point)

I don’t know how to go about this problem at all.

I don’t know how to go about this problem at all.