What are the description of lever?
A lever is a simple machine that makes work easier for use; it
involves moving a load around a pivot using a force. Many of our
basic tools use levers, including scissors (2 class 1 levers),
pliers (2 class 1 levers), hammer claws (a single class 2 lever),
nut crackers (2 class 2 levers), and tongs (2 class 3 levers).