Here's why:
* Effort: This term emphasizes the force that is being exerted by the user to operate the machine.
* Input force: This term focuses on the force that is going into the machine, as opposed to the output force that the machine produces.
It's important to note that the effort/input force is not always the same as the force the machine actually applies to the load. Simple machines can amplify or redirect the effort, resulting in a larger output force. For example, a lever can amplify the effort force to lift a heavier object.
So, while "force" is technically correct, the terms "effort" or "input force" are more precise when describing the force applied to a simple machine.
