Max turns the handle on a pencil sharpener. This turns the wheel that turns the blades. The blades sharpen the pencil. In this situation, what is the input force?

Max turns the handle on a pencil sharpener. This turns the wheel that turns the blades. The blades sharpen the pencil. In this situation, what is the input force?

Max turns the handle on a pencil sharpener. This turns the wheel that turns the blades. The blades sharpen the pencil. In this situation, what is the input force?

none

In this situation, the input force would be the force applied by Max when he turns the handle of the pencil sharpener.