5.1 Energy conservation

1 understand the concept of work, and recall and use work done = force × displacement in the direction of
the force
2 recall and apply the principle of conservation of energy
3 recall and understand that the efficiency of a system is the ratio of useful energy output from the
system to the total energy input
4 use the concept of efficiency to solve problems
5 define power as work done per unit time
6 solve problems using P = W/t
7 derive P = Fv and use it to solve problems