(Solved): 1. The principle of conservation of energy states that energy cannot be created or destroyed bu ...

1. The principle of conservation of energy states that energy cannot be created or destroyed but can be change from one form to another. The total energy is thereby constant. (a) Map out the energy changes taking place when a child swinging on a swing. (2) (b) Adam and Zam practised rock climbing on a vertical wall. The masses of Adam and Zam are 68 \\( \\mathrm{kg} \\) and \\( 46 \\mathrm{~kg} \\) respectively. The height of the wall is \\( 3.6 \\mathrm{~m} \\). (i) Calculated the gravitational potential energy gained by Adam and Zam respectively after reaching the top of the wall. (ii) The time taken by Adam and Zam to reach the top of the wall are \\( 11.5 \\mathrm{~s} \\) and \\( 8.0 \\mathrm{~s} \\) respectively. Determine who has generated more output power to reach the top of the wall. \\( \\left(\\mathrm{g}=9.8 \\mathrm{~ms}^{-1}\\right) \\) (9) (c) A machine is a tool that helps us to do work. Discuss THREE types of levers of simple machine with TWO appropriate example. (9) (Total / Jumlah: 20)