Which statement about friction loss is false?

Which statement about friction loss is false?

• A. As length increases, friction loss decreases
• B. Friction loss increases with hose length
• C. Friction loss is proportional to flow
• D. Friction loss depends on hose diameter

Answer: (A)

Friction loss is the pressure drop caused by water rubbing against the inside of the hose as it flows. For a given hose and flow, longer runs mean more contact with the hose interior, so more resistance accumulates and more pressure is lost along the way. That’s why friction loss increases with hose length. It also goes up when flow increases, since more water moving per second encounters resistance more frequently, and it depends on hose diameter because smaller diameter creates higher velocity and more friction for the same flow. So the statement that friction loss decreases as length increases is not true—friction loss actually increases with length.

Friction loss is the pressure drop caused by water rubbing against the inside of the hose as it flows. For a given hose and flow, longer runs mean more contact with the hose interior, so more resistance accumulates and more pressure is lost along the way. That’s why friction loss increases with hose length. It also goes up when flow increases, since more water moving per second encounters resistance more frequently, and it depends on hose diameter because smaller diameter creates higher velocity and more friction for the same flow.

So the statement that friction loss decreases as length increases is not true—friction loss actually increases with length.