What is the formula for calculating the actual mechanical advantage (AMA) of a real machine?

The actual mechanical advantage (AMA) of a real machine is calculated using the ratio of the resistance (output force) to the effort (input force) applied to the machine. This formula reflects how much the machine helps to lift or move a load compared to the force you apply to it, taking into account real-world factors like friction and material imperfections that affect efficiency.

AMA provides insight into how effectively a machine converts input energy into output work. When you divide the resistance force by the effort force, you obtain a value that represents the mechanical advantage realized in practice, as opposed to the ideal mechanical advantage (IMA), which assumes 100% efficiency. This distinction is crucial for understanding how machines function in practical applications where energy losses occur.

By understanding this relationship, one can evaluate the performance of various machines, whether they are simple devices like levers or more complex systems.