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Description
Flashcards by Adriana Vincelli-Joma, updated more than 1 year ago
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Created by Adriana Vincelli-Joma
about 3 years ago
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| Question | Answer |
| static equilibrium | -state of equilibrium in which net external force and torque is 0 -acceleration of system is 0 and accelerated rotation does not occur |
| dynamic equilibrium | -state of equilibrium in which net external force and torque on system moving with constant velocity are 0 |
| torque | -turning/twisting effectiveness of force rotational equivalent of force -measure of effectiveness of force in changing/accelerating rotation |
| perpendicular lever arm | -shortest distance from pivot point to line along which F lies -r_τ = rsinθ |
| formula for torque | -τ = rF┴ -τ = r(Fsinθ) -τ = F(rsinθ) -τ = Fr┴ |
| conditions to achieve equilibrium | --net F_x = 0 -net F_y = 0 -net τ = 0 |
| stable equilibrium | -displaced system that experiences net force or torque in direction opposite to direction of displacement |
| unstable equilibrium | -displaced system that experiences net force or torque in same direction as displacement from equilibrium |
| neutral equilibrium | -state of equilibrium that is independent of system's displacements from original position |
| simple machine: lever-type nail puller | (l_i)(F_i) = (l_0)(F_0) |
| mechanical advantage | -MA = (F_0) / (F_i) -MA = (l_i) / (l_0) |
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