Most people use levers to turn on and off a giant machine. But I only know that scientists use it. =)
Teeter totter
why are levers useful
slot machines
Levers allow you to manipulate heavy things with less force, at the cost of more distance traveled.
Levers will wear and tear after use and money will have to be spent to repair or replace them.
Door handles, car foot pedals, human appendages.
Archimedes
Levers have existed since prehistoric times. There is no record of who invented levers. The earliest mention of levers of which there is a record was by Archimedes, but they were in use long before his time.
Difficult, levers are essential in life. Mostly everything we use uses levers such as our body, airplanes, lifting things, scissiors, nutcrackers etc. Some things require levers and they would not be possible without them. Hope that helped :)
Mechanical advantage is not the only reason to use levers.
Scales and kitchen use.
as in?