Work, Energy and Power

Physics (Science Paper 1) · Chapter 2 · 1. Force, Work, Power and Energy

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Your path through this chapter

1
Visual lesson Beta
1. Part 1: Work, units and power12 slides
2. Part 2: Mechanical energy and its conservation14 slides
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Notes Beta
6 sections with key terms, formulas and exam tips.
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Flashcards Beta
30 cards for quick recall of key terms and facts.
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Practice
64 board-style questions with instant checks: Multiple choice 18, Short answer 12, Numerical 9, Fill in the blanks 7.
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Chapter test Free
Short and long chapter tests in board pattern, with results and analysis.
- Chapter test (long) — Work, Energy and Power · 40 marks · 60 min
- Chapter test (short) — Work, Energy and Power · 20 marks · 30 min
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Work done by a force: W = F s cos(theta); special cases at 0 and 90 degrees; work against gravity W = mgh
Energy as capacity to do work; units of work and energy (joule, erg, calorie, kW h, eV) and conversions
Power: P = W/t; units watt, kW, MW, GW and horsepower
Mechanical energy: gravitational potential energy U = mgh and kinetic energy K = (1/2)mv^2 with derivations
Other forms of energy and energy conversions in daily life
Principle of conservation of energy; U + K constant for a freely falling body; simple pendulum (qualitative)