first , thanks for the 'welcome' :)
all the replies were just great . now i understand it...
i should though of the work relation with displacement and force
anyway , thanks again .
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...