REALLY NEED HELP !!!!!!
write your answer to these questions in complete sentences on a sheet of paper.
draw a first- class lever. show the fulcrum,effort force,and resistance.
draw a second-class lever . show the fulcrum,effort force,and resistance.
draw a three-class lever.show the fulcrum,effort force,and resistance.
what is work input? what is work output?
what does efficiency tell you about a machine?