1. A small block of mass 25 kg is on a rough slope inclined at α degree to the horizontal. The block is held in equilibrium by a force of magnitude P N applied paralled to the slope and up the slope.
When P = 259, the block is abput to slip up the slope. When P = 35, the block is about to slip down the slope. In each case, the magnitude of the frictional force acting on the block is F N.
i.) Calculate the vlue of α and show that F = 112.
ii.) Calcaulate the coefficient of friction between the block and the slope.
2. The diagram shows a mass of 50 kg on a slope which makes an angle of 30 degree with the horizontal. The coefficient of friction between the mass and the slope is 0.25. You may assume that the mass does not tip up.
The diagram :: http://i121.photobucket.com/albums/o209/jenny_0531/1.jpg
Find the magnitude of the force T if
i.) the mass is about to move down the slope
ii.) the mass is about to move up the slope
iii.) the mass is accelerating at 5 ms^-2 up the slope.