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Biomechanics
Ch 3 Basic kinetic concepts
| Question | Answer |
|---|---|
| Inertia | resistance to acceleration (reluctance of a body to change its state of motion |
| Inertia units | has no units but is directly proportional to mass |
| Mass | the quantity of matter ( the amount of stuff). A direct measure of inertia |
| Mass units | Kilograms (kg) |
| Force | Push or pull acting on a body. If a strong enough, it may alter the body's state of motion |
| Force units | Newtons (N) |
| Weight | the force exerted on a body due to gravity |
| Weight equation | W = m x g |
| Pressure | amount of force acting over a given area |
| Pressure units | N/m^2 |
| Pressure equation | P = F / A |
| Volume | The amount of space a body occupies |
| Volume units | Liters 1 liter = 1000cm^3 |
| Density | mass per unit volume |
| Density units | kg/m^3 |
| Density equation | ρ (“rho”) = m/v |
| Torque | rotational effect created by an off-center force |
| Torque unit | Nm |
| Torque equation | T = F x d⊥ |
| Compression | Squeezing force |
| Tension | pulling force |
| Shear | causes a portion of a segment to slide with respect to another portion |
| Mechanical stress | Force distribution within the body likelihood of injury depends on stress |