What is the difference between a 1st class lever, a 2nd class lever and a 3rd class lever?
a. A 1st class lever has the effort applied at one end, the load at the other end, and the fulcrum in the middle. A 2nd class lever has the effort applied at one end, the fulcrum at the other end, and the load in the middle. A 3rd class lever has the fulcrum at one end, the effort applied in the middle, and the load at the other end.
b. A 1st class lever changes the direction of the force, a 2nd class lever increases the force, and a 3rd class lever increases the speed.
c. In a 1st class lever, the effort arm is longer than the load arm. In a 2nd class lever, the load arm is longer than the effort arm. In a 3rd class lever, the effort arm is shorter than the load arm.
d. A 1st class lever is commonly found in seesaws, a 2nd class lever is commonly found in wheelbarrows, and a 3rd class lever is commonly found in shovels.