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Third-class levers have an input force, a fulcrum and an output force. The placement of the fulcrum, input and output forces of the lever determines its type. More »

www.reference.com Science Physics Motion & Mechanics

Examples of first-class levers include a balance scale, a seesaw and a crowbar. A first-class lever places the fulcrum in the middle of the effort and the load. More »

www.reference.com Science Physics Motion & Mechanics

Examples of second class levers include doors, staplers, wheelbarrows and can openers. In a second class lever, the load is found between the effort and the fulcrum. The direction of the effort and the load are the same. More »

www.reference.com Science Physics Motion & Mechanics
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Mechanical advantage is the amplification of force achieved by using a machine system, expressed as the output force divided by the input force. There is a difference, however, between the mechanical advantage a machine ... More »

www.reference.com Science Physics Motion & Mechanics

The first class lever uses the fulcrum in between the applied force and load, the second class lever uses the load between the fulcrum and applied force and the third class lever uses the applied force between the fulcru... More »

www.reference.com Science Physics Motion & Mechanics

A first-class lever, in which the fulcrum is between the load and the effort, can aid in work by changing the direction of the force and by increasing the efficiency or mechanical advantage of the force applied. The forc... More »

www.reference.com Science Physics Motion & Mechanics

The formula for mechanical efficiency is 100(Wo/Wi), where Wo is the work output and Wi is the work input. Work is a product of force and distance, so the two are interrelated. Because of the laws of thermodynamics, some... More »

www.reference.com Science Physics Motion & Mechanics