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22 Cards in this Set
- Front
- Back
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KINETICS
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area of biomechanics that describes force that causes human movements
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INTERNAL FORCES
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muscle contractions, tension in stretched connective tissue, and bones
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EXTERNAL FORCES
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gravity, friction, or an external load
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TYPES OF FORCE
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Compression, Tension, Gravity, and Friction
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COMPRESSION
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force that presses objects together
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TENSION
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force that pulls objects apart
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GRAVITY
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attraction of an object to earth
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FRICTION
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resistance to movement b/w two contacting surfaces
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FORCE VECTORS
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point of application, magnitude, direction
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LAWS OF MOTION
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Law of Inertia, Law of Acceleration, Law of Action-Reaction
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LAW OF INERTIA
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states that the body remains at rest or a constant velocity unless acted on by an unbalanced force
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LAW OF ACCELERATION
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states that the acceleration of the body is directly proportional to the force causing the acceleration and is inversely proportional to the mass of the body
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LAW OF ACTION - REACTION
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states that for every action there is an equal and opposite reaction
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FIRST CLASS LEVER
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axis of rotation is b/w the opposing forces (teeter tottor)
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SECOND CLASS LEVER
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resistance is between the force and the axis of rotation (wheel barrow)
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THIRD CLASS LEVER
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force is b/w the axis of rotation and resistance
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MOST COMMON LEVER IN BODY
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third class lever
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TORQUE
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rotational force
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MECHANICAL ADVANTAGE
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the ratio of the internal moment arm to the external moment arm
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CENTER OF GRAVITY
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hypothetical point in the body where the mass is evenly distributed, just anterior to S2
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LINE OF GRAVITY
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direction of gravitional pull on the body, passes anterior to the atlanto-occipital joint, posterior to the hip, anterior to the knees, and anterior to the medial/lateral malleoli of ankles
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BASE OF SUPPORT
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area of contact b/w the body and the supporting surface
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