- #1
ali171
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Don't "mechanical advantage" disagree with the law of nature ?
hello
I just can't swallow the idea of mechanical advantage.
* if you have a 10 KG mass , you need , say , 100 N to left it up
* if your friend helps you , each one of you will exert only 50 N
* but if you are alone , and you have two pulleys in a distinct
configuration , then - again - you need only 50 N
I just want to ask :
in the third case , who is the "friend" that exerts the
other 50 N ?? from where did that energy came from ??
isn't energy "cannot be created" ??
hello
I just can't swallow the idea of mechanical advantage.
* if you have a 10 KG mass , you need , say , 100 N to left it up
* if your friend helps you , each one of you will exert only 50 N
* but if you are alone , and you have two pulleys in a distinct
configuration , then - again - you need only 50 N
I just want to ask :
in the third case , who is the "friend" that exerts the
other 50 N ?? from where did that energy came from ??
isn't energy "cannot be created" ??
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