K.C.S.E Physics Q & A - MODEL 2010PP1QN15

K.C.S.E Physics Q & A - MODEL 2010PP1QN15

​(a) A cyclist initially at rest moved down a hill without pedaling. He applied brakes and eventually stopped. State the energy changes as the cyclist moved down the hill. 
(b) Figure 7 shows a mass of 30kg being pulled from point P to point Q, with a force of 200N parallel to an inclined plane. The distance between P and Q is 225m. In being moved from P to Q the mass is raised through a vertical height of 75m.
(i) Determine the work done:

​I by the force; 
II on the mass; 
III to overcome friction. 
(ii) Determine the efficiency of the inclined plane. 
(c) Suggest one method of improving the efficiency of an inclined plane

answers