Why the firemen have to hold the hosepipe tightly while putting out fire?
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The force the firefighters apply is called an outside force because it is not being applied by the hose or the water. When there is an outside force on a system, momentum is not conserved. Because the firefighters hold the hose, the hose does not move backward, even though the water has a forward momentum.
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When a fireman holds a hosepipe, which is ejecting large amounts of water at a high velocity, then a reaction force is exerted on him by the ejecting water in the backward direction. This is because of Newton’s third law of motion. As a result of the backward force, the stability of the fireman decreases. Hence, it is difficult for him to remain stable while holding the hosepipe.
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