Question

When a person jump from boat to shore the boat moves backward and the person fall down. Why?

Answer 1

Hey Mate

Here is your answer

It is due to the Newton's Third law of motion. Every action has an equal and an opposite reaction. As the boat is unstable in water the person who jumps pushes the boat backwards due to inertia and thus falls down.

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Answer 2

The momentum of an object is its mass multiplied by its velocity. The total momentum of all bodies is the same, everywhere, always (even during explosions).

When you jump ashore, you gain momentum towards the shore. That means that something must gain an exact equal amount of momentum away from the shore. Since you jumped off the boat, it’s the boat that moves (as others said, per Newton’s Second Law). The velocity of the boat will be given by v2=−v1×m1/m2v2=−v1×m1/m2where v1v1 is your velocity and m1m1 , m2m2are your respective masses. If the boat is large, m2m2 is large and you won’t notice. In a small boat, with a small mass, the effect is much larger. If I step off the front of my little catamaran, which weighs about the same as I do, from the point of view of an observer on the shore I moved half as fast as I would normally, fell short of the dock, and went in the water.