Simple Machines: Levers

The video tutorial explains the concept of levers, a type of simple machine, and their function in multiplying or changing the direction of effort force. It covers the three main classes of levers: first-class, where the fulcrum is between the effort and resistance forces; second-class, where the resistance is between the fulcrum and effort; and third-class, where the effort is between the fulcrum and resistance. Examples like seesaws, bottle openers, and fishing poles illustrate these classes. The video also discusses mechanical advantage, which is the factor by which a lever multiplies the effort force, and how it can be calculated.

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