ABSTRACT
At the end of this chapter you should be able to: • define work and state its unit • perform simple calculations on work done • appreciate that the area under a force/
distance graph gives work done • perform calculations on a force/distance
graph to determine work done • define energy and state its unit • state several forms of energy • state the principle of conservation of
energy and give examples of conversions • define and calculate efficiency of systems • define power and state its unit • understand that power = force × velocity • perform calculations involving power,
work done, energy and efficiency • define potential energy • perform calculations involving potential
energy = mgh • define kinetic energy • perform calculations involving kinetic
energy = 12mv2 • distinguish between elastic and inelastic
collisions • perform calculations involving kinetic
energy in rotation = 12Iω2
If a body moves as a result of a force being applied to it, the force is said to do work on the body. The the
force and the distance, i.e.
