Which of the following simple machine makes work more convenient by changing the direction of effort?
a) Pulley
b) Wheel and axle
c) Inclined plane
d) Wedge
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Answer:
a) Pulley
Explanation:
A single fixed pulley does not increase or decrease force. It simply changes its direction. It is difficult to pull a bucket of water from a well. A pulley makes it easier by changing the direction in which the force is applied.
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