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🔬 Science - Class 8
Unit 6 · Force and Motion

Efficiency Presentation

ScienceSubject
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Science and Technology, Grade 8

Efficiency

Velocity ratio · Input and output work · η = MA / VR × 100%

What We Will Learn Today

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Find the velocity ratio from effort distance and load distance

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Tell input work apart from output work

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Work out efficiency as a percentage

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See why friction keeps efficiency down

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Presenter notes: Today we start from a simple question: when a lever makes the force smaller, what does it ask for in return? Both the velocity ratio and the efficiency grow out of that question.