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imaginary vertical line passing through the center of gravity toward the center of the earth.
(LOG) |
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| occurs when an object is in a position where disturbing it would require its center of gravity to be raised. |
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| occurs when only slight force is needed to disturb an object. |
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| exists when an object's center of gravity remains the same. |
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A lever will favor either power/distance. The advantage gained in Power is lost in Distance. Lever is ridged and can rotate around a fixed point when force is applied.
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| fixed point around which a lever can rotate (referred to as th fulcrum) |
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| distance between the resistance and the axis. |
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- First Class Lever
- Second Class Lever
- Third Class Lever
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Axis is located between the force and resistance.
Ex: The head moving on the neck tilting forward and backward. |
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Resistance is in the middle with the axis at one end and force at the other end.
Advantage: what is gained in power is lost in resistance.
Ex: ankle planter flexion |
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Has force in the middle with resistance and the axis at the opposite end.
Advantage: speed and distance |
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| Factors that change class |
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1. When the center of gravity of the resistance is located farther from the axis than the force.
2. When the direction of movement in relation to gravity. |
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| Grooved wheel that turns on an axis with a rope or cable riding in the groove. |
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| simple pulley attached to a beam. |
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| has one end of the rope attached to the beam- rope runs through the pulley to the other end where force is applied. |
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| number of the times a machine multiplies the force |
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| used to increase the force that is exerted. |
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| Ex: wheelchair accessibility- wheelchair ramp |
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