Simple machines — KCSE Physics
KCSE Physics · 114 practice questions · 6 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Define mechanical advantage (MA), velocity ratio (VR) and efficiency for a machine; write the formulae
Calculate MA, VR and efficiency for levers, pulleys, inclined planes and wheel-and-axle systems
Explain why efficiency is always less than 100% and identify factors that reduce efficiency in machines
Define mechanical advantage, velocity ratio, and efficiency; solve problems involving simple machines
Apply the principle of moments to determine unknown forces and weights
Simple machines
Sample Questions
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A uniform beam of length 4 m and weight 200 N is supported at one end. A 100 N load is placed 1 m from the free end. (a) Identify the point at which the beam will balance. (2 marks)
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State two reasons why the efficiency of a simple machine is always less than 100%. (2 marks)
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An inclined plane has a length of 5 m and a height of 2 m. Calculate the velocity ratio of the inclined plane. (3 marks)
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Why Practise Simple machines?
KNEC Aligned
Questions match the KCSE syllabus objectives and exam format exactly.
Detailed Marking Schemes
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