K.C.S.E Physics Q & A - MODEL 2014PP1QN18

K.C.S.E Physics Q & A - MODEL 2014PP1QN18

​(a) When a bus goes round a bend on a flat road, it experiences a centripetal force.
State what provides the centripetal force. 
(b) State the purpose of banking roads at bends. 
(c) A student whirls a stone of mass 0.2 kg tied to a string of length 0.4 m in a vertical plane at a constant speed of 2 revolutions per second.
(Take acceleration due to gravity g as 10 m/s2)
(i) State two forces acting of the stone when it is at the highest point. 
(ii) Determine the:
I angular velocity of the stone; 
II tension in the string when the stone is at the highest point; 

answers

 ​(a) Friction between road and tyre.
(b) Increases the centripetal force acting on the bus.
(c) (i) Weight
    Tension