LEVERS - EXS 350 Levers Levers A lever is defined as a...

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EXS 350 Levers Levers A lever is defined as a rigid bar which turns about an axis (fulcrum). Every lever has four components: a rigid bar, a fulcrum, an effort force, and a resistance force. o the bone is the rigid bar o the joint is the fulcrum o muscular contraction provides the effort force to move the lever o resistance force is provided by: mass of the body part being accelerated by gravity external weight being carried, lifted, or lowered (a suitcase) other muscular action in opposition Every lever - regardless of its kind - has two separate arms: o the Force Arm (FA) this is the perpendicular distance from the axis to the line of action of the force o the Resistance Arm (RA) this is the perpendicular distance from the axis to the line of action of the resistance
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There are three classes of levers: 1 st Class Lever The axis of movement falls between the point of application of the effort force and the resistance force A first class lever is good for: o balance - if the axis is midway between the force and resistance o speed and range of movement - if the axis is nearer to the point of application of the force o strength and force - if the axis is nearer to the line of action of the resistance o typical examples: a seesaw, using a crowbar, elbow extension
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This note was uploaded on 09/25/2010 for the course EXS 31757 taught by Professor Brennan during the Spring '10 term at Oakland University.

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LEVERS - EXS 350 Levers Levers A lever is defined as a...

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