Key Equations - Physics

conservation of energy

K E_{1} + P E_{1} = K E_{2} + P E_{2}

ideal mechanical advantage (general)	$I M A = \frac{F_{r}}{F_{e}} = \frac{d_{e}}{d_{r}}$
ideal mechanical advantage (lever)	$I M A = \frac{L_{e}}{L_{r}}$
ideal mechanical advantage (wheel and axle)	$I M A = \frac{R}{r}$
ideal mechanical advantage (inclined plane)	$I M A = \frac{L}{h}$
ideal mechanical advantage (wedge)	$I M A = \frac{L}{t}$
ideal mechanical advantage (pulley)	$I M A = N$
ideal mechanical advantage (screw)	$I M A = \frac{2 π L}{P}$
input work	$W_{i} = F_{i} d_{i}$
output work	$W_{o} = F_{o} d_{o}$
efficiency output	$% efficiency = \frac{W_{o}}{W_{i}} \times 100$