PHYS 200 Unit 9: Statics and Torque

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)

Resource summary

	Created by Adriana Vincelli-Joma about 3 years ago