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Biomechanics02

Biomechanics02 - If a person has a mass of 80 kg his weight...

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Unformatted text preview: If a person has a mass of 80 kg, his weight = (80 kg) (9.81 m/sz) = 785 N Torque — the product of force and the perpendicular distance from the force’s line of action to the axis of rotation. It may be thought of as rotary force. Units = Newton-meters (N-m) Moment arm — the perpendicular distance between the force’s line of action and the axis of rotation. Mechanical advantage of a lever — the ratio of force arm length to resistance arm length Volume — the amount of space that a body occupies Pressure — force distributed over a given area. Units = N/cm2 P = F/A Compression — pressing or squeezing force directly axially through a body Tension — pulling or stretching force directly axially through a body Shear — force directed parallel to a surface Mechanical stress = F/A Similar to pressure. Lifting A Heavy Object From the Floor 1. If the object is very heavy, get someone to help you. Don't be a "hero". Use techniques that minimize the actual weight of the load being handled. 2. Stand facing the object with your feet ﬂat on the ﬂoor, at shoulder width, and pointing straight ahead. Ensure that you have a stable base of support so that you don’t slip as you are lifting the load. 3. Face the object in the direction which you intend to move with it, so that you don't have to turn while holding the object. Avoid twisting and the simultaneous generation of high twisting torques. ...
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