Grade 10 Physics · Strand 1: Mechanics and Thermal Physics · Energy, Work, Power and Machines
Concept and Measurement of Work
A short Grade 10 Physics lesson for the CBE curriculum, part of Mechanics and Thermal Physics: Energy, Work, Power and Machines. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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1. A learner leans with all her strength against a solid stone wall for two hours. The wall does not move. How much scientific work is done on the wall?
- A. Zero, because the displacement is zero
- B. A large amount, because she gets tired
- C. Equal to her weight multiplied by two hours
- D. Equal to the force multiplied by the time
2. An ox pulls a plough with a steady horizontal force of 450 N along a furrow 12 m long. Calculate the work done by the ox.
Type your answer (in J) in the lesson.
3. A student lifts a 20 kg jerrycan of water vertically onto a lorry bed 1.5 m high at steady speed. Taking g = 10 N/kg, calculate the work done against gravity.
Type your answer (in J) in the lesson.
4. A spring is stretched so that the force rises uniformly from 0 N to 50 N while it extends by 0.4 m. What is the work done, found from the area under the force–distance graph?
- A. 10 J
- B. 20 J
- C. 25 J
- D. 50 J
5. What is the SI unit of work, equal to one newton-metre?
Type your answer in the lesson.
More in Energy, Work, Power and Machines
- Parallel Forces and Multiple Supports
- Torque, Couples and Resolution of Forces
- Practical Applications and System Consolidation
- Forms of Energy & Conservation
- Power and the Rate of Doing Work
- Introduction to Machines, Mechanical Advantage and Velocity Ratio
- Machine Efficiency and Energy Losses
- Levers and the Principle of Moments
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