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| Taking the principles & methods of mechanics & applying them to the structure & function of the human body |
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| Study of forces & motion produced by their actions |
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| Forces causing movement in a system |
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| Involves the time, space and mass aspect of moving |
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| Bones move space without regard to the movement of joint surfaces (shoulder flexion/extension) |
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| Adjoining joint surfaces move in relation to each other (same or opposite directions) |
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| Quantity having both magnitude and direction (pushing at a certain speed in a certain direction) |
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| A vector that describes speed and is measured in units |
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| Quantity that describes only magnitude (length area volume) |
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| Amount of matter that a body contains |
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| Property of matter that causes it to RESIST any changes of its motion in either speed or direction |
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| Tendency of force to produce rotation around an axis (muscles in the body produce motion around an axis) |
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| Force developed by 2 surfaces, which tends to prevent motion of one surface across another (sliding feet with stockings across carpet) |
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| Law of Inertia, Law of Acceleration, Law of Action-Reaction |
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| The tendency of an object to stay at rest or in motion (example: whiplash) |
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| Amount of acceleration depends on the strength of the force applied |
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| For every action there is an equal and opposite action |
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| Any change in the velocity of an object |
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| One object must act on another |
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| 2 or more forces pulling along the same line |
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| Same plane and in opposite direction |
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| Two or more forces must act on a common point |
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| Overall effect of the two different forces of the concurrent forces |
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| Graph showing vector using solid lines (two forces) complete the parellogram using dotted lines |
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| Two or more forces act in different directions- results in a turning effect |
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| Moment of force/ability of force to produce rotation around an axis. It is the greatest when the angle of pull is a 90 degrees. No torque is produced if the force is directed exactly through the axis of rotation. |
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| The force generated by the muscle is primarily a stabilizing force |
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| Force that is generated by the muscle |
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| Past 90 degrees- force is directed away from the joint |
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| Depends on the relationship between the object's center of gravity and it's base of support |
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| The mutual attraction between earth and an object |
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| Always directed vertically downward and toward the center of the earth |
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| Balance point of an abject at which torque on all sides is equal |
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| Part of the body that is in contact with the supporting surface |
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