A-level · Work, energy & power

PowerExam-style questions

Power as the rate of doing work, average power = work ÷ time, and the key working relationship P = Fv for a driving force — used to find engine power at constant speed and, by combining P = Fv with Newton's second law, the instantaneous acceleration of a vehicle on a level road or a hill.

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22 questions · A Level level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 1Level 2Level 3Level 4Level 5
  1. 1
    A crane does 60000 J60000\text{ J} of work in raising a load in 20 s20\text{ s}. Find the average power developed. (2 marks)
    Level 1 · 2 marksTry it
  2. 2
    A motor does 5400 J5400\text{ J} of work in 30 s30\text{ s}.

    Find its average power. (2 marks)
    Level 1 · 2 marksTry it