FORESTRY
PLANT AND WOOD ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Farmer Bob decides to use a compound pulley to raise a box up to the top of his barn. What is the purpose of using a simple machine in this case?
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to reduce the amount of friction
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to reduce the distance the box has to travel
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to reduce the amount of work needed to lift the box
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to reduce the amount of force needed to lift the box
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Explanation:
Detailed explanation-1: -With a compound pulley-two or more pulleys combined together-you can reduce the force required to lift the load. This reduction doesn’t come for free though-due to conservation of energy, it increases the distance over which you must exert a force. (Energy equals force times distance.)
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