Which of the following is a crush hazard?

A mower deck falling on your foot represents a crush hazard because it involves a heavy object that, when it falls, can exert significant force on the body, particularly on a smaller area like a foot. Crush hazards are defined by the potential for significant injury due to the weight and impact of falling equipment. In this case, if the mower deck detaches from the machine and lands on a person’s foot, it could cause serious injury, such as fractures or tissue damage.

In contrast, while a tractor rolling down a hill poses serious dangers, it primarily relates to risks of collision or loss of control rather than a direct crush hazard. A frayed electrical wire is more associated with electrical hazards, potentially leading to shock or fire rather than crushing injuries. A slippery surface can lead to slips and falls, which, although dangerous, do not fall into the category of a crush hazard. Thus, the selected answer aptly identifies the situation that best exemplifies a crush hazard in the context of tractor operation.