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18 Cards in this Set
- Front
- Back
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Movement of the body is the result from either:
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1. external forces greater than internal forces or...
2. internal forces greater than external forces. |
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When internal forces equal external forces, then the body is said to be in...
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equilibrium.
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If a body is motionless then it is in...
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static equilibrium.
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If a body is moving at a CONSTANT velocity then it is in...
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dynamic equilibrium.
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The ability to control our equilibrium is known as...
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balance.
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The ability to control our equilibrium is known as...
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balance.
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The ability to resist disruption of equilibrium is known as...
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stability.
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Factors that can affect stability and balance:
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1. mass of an object
2. amount of friction between surfaces 3. base of support size 4. position of the center of gravity |
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Area bound by the outermost regions of contact between a body and the support surface:
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Base of Support (BOS)
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Balance point of an object, geometric center of mass, natural axis of rotation:
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Center of Gravity (CG)
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Is easily and frequently altered in humans and difficult to precisely locate:
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center of gravity
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When a force acts on a body two things can happen:
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1. The body can move.
2. The body can change shape or deform. |
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The amount of deformation is related to...
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the magnitude of the force and the type of material that is loaded.
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When force acts on a body, that force is distributed over the area upon which the force acts, this is termed...
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Stress
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σ = F/A
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σ = stress
F = force A = cross-sectional area of the surface |
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Three principle types of stresses:
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1. Compression
2. Tension 3. Shearing |
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A pressing or squeezing force directed axially through the body:
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Compression.
Can cause cruch type injuries, fractures. |
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Factors which influence strength in compression:
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1. Nature or type of the material.
2. Amount of material in cross-sectional area. |
