We learned about actual mechanical advantage (AMA) and ideological mechanical advantage (IMA). The actual mechanical advantage is the ratio of output force to input force of a machine. It is represented by by output force / input force. IMA is the ratio of output distance to input distance of a machine. It is represented by the formula D in / D out. AMA/IMA is equal to the efficiency. By definition efficiency of a machine is the ratio of useful energy output to the total energy output.














