Ok, so we've been set some pretty easy homework involving energy transfers e.g. Kinetic energy --> sound energy.. And in 1 of these questions it involves 2 clock which require no electricity to function the first is a pendulum clock with a cord where you lift up a weight which will slowly fall powering the clock. So here's what I put: Kinetic energy--> Gravitational potential energy--> Kinetic energy. The second clock has a coil which is tightened and as it slowly unravels it powers the clock. So here what I put: Kinetic energy-->Elastic potential energy--> Kinetic energy. Now here's my problem in these basic G.C.S.E. Transfer questions should I include Sound energy? (for the clock ticking.) Would you of put the sane answers as me?