physics revision

4.11   work done = force x distance                                                                    (W = Fd) 

4.12 work done is equal (=) to the  energy transferred 

4.13 gravitational potential energy=mass x gravitational field strength x height (GPE =mgh)

4.14 kinetic energy = 1/2 x mass x (velocity)2                                          (KE = 1/2 m v2) 

4.15 conservation of energy produces a link:

work done = kinetic energy - gravitational potential energy                     (W = KE - GPE)

4.16 power is the rate of transfer of energy or the rate of doing work]

4.17 power = work done/time taken 

        P = W/t