The amount by which a machine multiplies an input force is called : ( C ) mechanical advantage
Mechanical advantage measures the ratio of output force to the input force applied to get a task done in a system with the help of simple machines such as levers.
For a machine to have a mechanical advantage the output force must be greater than the input force. ( i.e. the amount of force applied by human into the system should be less when compared to the output force of the machine )
Therefore we can conclude that the amount by which a machine multiplies an input force is the mechanical advantage.
learn more about mechanical advantage : https://brainly.com/question/1492025
