K.C.S.E Physics Q & A - MODEL 2015PP1QN15

K.C.S.E Physics Q & A - MODEL 2015PP1QN15

(a) Figure 8 shows a 200 g mass placed on a frictionless surface and attached to a spring.

The spring is compressed and released. Given that the elastic potential energy of the compressed spring is 2.7 X 10^-2 J, determine the maximum speed with which the block moves after it is released.
(b) In a wheel and axle system, state the advantage of having a large wheel diameter compared to the axle diameter for a frictionless system.
(c) A body is released from a height h. Sketch a graph of potential energy against kinetic energy as the body falls to the ground.
(d) Figure 9 shows a hydraulic lift system. The radius of the small piston is 3 cm while that of the larger piston is 9 cm. A force of 90 N is applied to the smaller piston.

Determine the:
(i) maximum load that can be lifted.
(ii) efficiency of the system.

answers

​(b)(b) Reduces the effort required to raise the 1oad (increases the mechanical advantage.)