Nozzle reaction is best described as the backward force exerted on the nozzle operator by the exiting water.

Nozzle reaction is best described as the backward force exerted on the nozzle operator by the exiting water.

• A. It is the backward force exerted on the nozzle operator by the exiting water
• B. It is the forward push of water on the target
• C. It is the friction loss in the hose
• D. It is the rise in temperature of the nozzle

Answer: (A)

Nozzle reaction comes from Newton’s third law: water is accelerated forward as it exits the nozzle, so the nozzle must push on the water to give it that speed. In return, the water pushes backward on the nozzle and the operator. This recoil grows with higher flow and pressure, which is why nozzle reaction can be a strong backward push you feel when the water exits. It’s this backward force on the operator from the outgoing water that best describes nozzle reaction. It’s not about the water’s impact on a target, not a friction loss in the hose, and not a rise in temperature—these describe different effects.

Nozzle reaction comes from Newton’s third law: water is accelerated forward as it exits the nozzle, so the nozzle must push on the water to give it that speed. In return, the water pushes backward on the nozzle and the operator. This recoil grows with higher flow and pressure, which is why nozzle reaction can be a strong backward push you feel when the water exits. It’s this backward force on the operator from the outgoing water that best describes nozzle reaction.

It’s not about the water’s impact on a target, not a friction loss in the hose, and not a rise in temperature—these describe different effects.