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First-class Levers. Typical examples of first-class lever are the crowbar, seesaw, and elbow extension. An example of this type of lever in the body is seen with the triceps applying the force to the olecranon (F) in extending the nonsupported forearm (W) at the elbow (A).
Three classes of levers: Class 1 (top), Class 2 (middle) and Class 3 (bottom) Common Levers Some common types of Class 1 levers are a pair of scissors or boat oars, toilet handle, seesaw, and.
Name: Levers Simple Machines Levers are used to help lift heavy objects Lever: a simple machine that is used to change the direction of force needed to move an object over a fulcrum (pivot point) The different kinds of levers depend on where the fulcrum is located They work by using a strong beam that pivots at a point called the fulcrum.
First-class levers have a considerable practical advantage over the other types of levers. They convert a downward moving force into a lifting force. This means that you can always augment your ability to lift a load across a teeter-totter style lever simply by using the force of gravity.