9 lol Salar Energy Wind Energy Screw Elastic ll 12 13 5) force exerted by a machine 1 A nail having grooves 3 Stretched string of a bow d) Solar cooked Mechanical force e Turbine Fuel (6) Frictional force Ability to do work 19 Heat ene energy Stereo system by Potential energy Slows down moving object water in a dam Energy hr Burning Fuel INS 1.6 Sound energy 12 18