[Answer] Any part of a machine which ___ while in operation can cause a hazard.

Answer: Moves

Most relevant text from all around the web:

Any part of a machine which ___ while in operation can cause a hazard. Other moving parts: all parts of the machine which move while the machine is working. These can include reciprocating rotating and transverse moving parts as well as feed mechanisms and auxiliary parts of the machine. Hazardous Mechanical Motions and Actions A wide variety of mechanical motions and actions may present hazards to the worker. A good rule to remember is: Any machine part function or process which may cause injury must be machine guarded . When the operation of a machine or accidental contact with it can injure the operator or others in the vicinity the hazards must be either controlled or eliminated. Any machine part function or process that might cause injury must be safeguarded . When the operation of a machine or accidental contact with it could injure the operator or others in the vicinity the hazards must be either controlled or eliminated. Electrical Hazards – equipment that uses electricity as a power source is a potential electrocution hazard. Check power cords switches and connections for exposed wires or broken parts. Amputation & Caught-in Hazard s – machine guards on equipment are installed to protect our emplo...

Disclaimer: 

Our tool is still learning and trying its best to find the correct answer to your question. Now its your turn, "The more we share The more we have". Comment any other details to improve the description, we will update answer while you visit us next time...Kindly check our comments section, Sometimes our tool may wrong but not our users.

Are We Wrong To Think We're Right? Then Give Right Answer Below As Comment