lunes, 2 de febrero de 2015

(unit_2)Simple machines: types of levers


There are three types of levers: class 1, class 2 and class 3.

There are three main parts: point of support or fulcrum, resistance or load and force or effort

Class 1 lever:

The fulcrum is in the middle. It is between the force and the resistance.

Examples: Scissors and pliers

Class 2 lever:

The load or resistance is in the middle.

Examples: wheel barrels and nutcrackers



Class 3 lever:

The force or effort is in the middle.
Examples: stapler and tweezers


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