Work, energy and power — KCSE Physics
KCSE Physics · 108 practice questions · 7 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Define power and calculate P = W/t; state the SI unit (watt) and convert between watts and kilowatts
Define work done by a force and calculate W = Fd cos θ; state the SI unit (joule)
Define kinetic energy (KE = ½mv²) and gravitational potential energy (GPE = mgh) and perform calculations
Identify renewable and non-renewable sources of energy
Define energy and state the law of conservation of energy; identify energy forms and transformations
Define work, kinetic energy, potential energy, and power; state their SI units and solve calculations
Work, energy and power
Sample Questions
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State the energy transformation that takes place in each of the following: (a) An X-ray tube when fast-moving electrons are stopped by the target. (1 mark) (b) A ball bouncing on a floor. (2 marks) (c) A liquid changing into vapour. (2 marks)
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In the study of physical sciences, understanding the fundamental concepts related to energy transfer and mechanical systems is essential. Consider the definitions and classifications that underpin these principles. (a) Define work and state its SI unit. (2 marks) (b) Define power and state its SI unit. (2 marks) (c) State the two forms of mechanical energy. (2 marks)
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In the context of a student’s experience with energy transformations during physical activities, consider the concepts of energy associated with an object’s position and motion. Analyze the distinctions and calculations related to these forms of energy in the scenarios provided. (a) Distinguish between gravitational potential energy and kinetic energy. (2 marks) (b) State the formula for calculating gravitational potential energy. (1 mark) (c) A student carries a 4 kg bag to the first floor of a building, 3 m above the ground. Calculate the potential energy gained by the bag. (Take g = 10 N/kg.) (2 marks)
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Why Practise Work, energy and power?
KNEC Aligned
Questions match the KCSE syllabus objectives and exam format exactly.
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