Two or more pulleys used together constitute a block and tackle which, unlike a fixed pulley, does impart mechanical advantage as a function of the number of pulleys that make up the arrangement. So, for example, a block and tackle with three pulleys would have a mechanical advantage of three.
The mechanical advantage of a block and tackle is equal to which of the following?
the number of input forces |
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the number of pulleys |
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the number of connecting ropes |
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the number of loads |