Question

water sprinkler used for grass lawns begins to rotate as soon as the water is supplied explain the principle on which it works

Answer 1

It is based on the third law of motion which states that for every action there is an equal and opposite reaction. As the water comes out of the sprinkler, an equal and opposite reaction force comes into play. So the sprinklers start rotating

Hope it helps you .

Answer 2

When water is pushed out of sprinkler with a force, it exerts reaction force on the sprinkler causing it to rotate.