ZIMSEC O-Level Combined Science
7.3.3.4Machines
Machines in ZIMSEC O-Level Combined Science: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic44 practice questions3 lessons
Overview
Forms 2 and 3.
Learning objectives
What the syllabus expects you to be able to do.
- 7.3.3.4.1Define a machine and construct a simple machine.
- 7.3.3.4.2Describe the uses of levers, pulley systems, inclined planes and gears.
- 7.3.3.4.3Determine the mechanical advantage, velocity ratio and efficiency of simple machines.
- 7.3.3.4.4Explain energy losses in machines and ways of improving efficiency.
Lessons
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Efficiency
20 min
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Gears
30 min
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Simple machines: levers, pulleys and inclined planes
30 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
Turn Machines into a strength.
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