Force, energy and momentum exam tips

Exam tips

• Check for Energy Losses in Real Systems

  When analysing a mechanical system, always identify where kinetic or potential energy is converted into heat, sound or frictional work. Write a short energy balance: total input = useful output + dissipated energy. This helps you spot hidden losses and calculate efficiency accurately.

  Recognising energy dissipation ensures you correctly apply conservation of energy and avoid overestimating useful work, a common exam pitfall.

• Conservation of Energy in Mechanics

  When solving multi-step mechanics problems, always identify the energy types involved and apply the conservation of energy principle. Set the total initial energy equal to the total final energy, accounting for any energy transfers.

  This approach helps ensure that you accurately account for all energy changes, leading to correct solutions in complex problems.