Final answer:
The diagram represents a lever system in M M discrimination training (left lever pull).
Step-by-step explanation:
The diagram in M M discrimination training (left lever pull) represents a lever system. A lever is a simple machine that consists of a rigid bar (lever arm) pivoted on a fulcrum. In this case, the fulcrum is represented by the dot in the center of the diagram. The two small red arrows pointing up and down represent the forces exerted by the lever arm, labeled Fb and Fg respectively. The two long red arrows pointing right and left represent the applied forces, labeled Fc and Fw respectively.