Key Equations

conservation of energy

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

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

Resources