D. 4 You have to load your suitcase on to a truck you are not able to lift the suitcase. which simple machine can help you to do this? why?
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Answer: Pulleys make lifting easier because more sections of rope are supporting the weight. It is much easier to pull down than to pull up a load, as our own body weight and gravity help us to pull down. Thus, a pulley is used extensively to do twice as much work with the same effort.
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