Question

what is an input force?

the applied force on a system

the force a simple machine applies to an object

the force a person applies to a simple machine

the net force on a system

Explanation:

To determine the correct definition of input force, we analyze each option:

• "The applied force on a system" is too general and not specific to simple machines.
• "The force a simple machine applies to an object" describes output force (the force the machine exerts on the load).
• "The force a person applies to a simple machine" matches the definition of input force, as input force is the force applied to a simple machine (often by a person or another source) to make it work.
• "The net force on a system" is unrelated to the concept of input force in the context of simple machines.

Answer:

C. the force a person applies to a simple machine