Question

if someone jump from boat on the Shore, the boat moves in opposite direction. give reason

Answer 1

Hello there dearest !!

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Answer
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<<<When we jump on a boat it moves backward >>>

Just like when you jump on the ground , you exert a force on t he ground, but you are comparatively too small and apply much smaller force to make the ground move as it is much larger.

But on a boat it is different .....first of all its design is made so that it can easily be sailed, when you jump of with a certain force , it's enough to make it move.

When u jump on one side of about the side submerges a bit under water and a push is generated on that side ,so it starts moving in opposite side.
Take example of a seesaw, the side you sit ,other side raises up , just like it ... :-)

I hope my answer did helped you......

Answer 2

Hi there!

Here's the answer:

It is due to Law of Conservation of momentum.

Explanation:

→The momentum of an object is its mass multiplied by its velocity (P= mv). The total momentum of all bodies is the same, everywhere, always.

→When someone jumps ashore, the person gains momentum towards the shore. Since the person jumped off the boat, it's the boat that moves moves(as per Newton's second law).

→The velocity of the boat will be given by

$v_{2} = -v_{1}*(\frac{m_{1}}{m_{2}})$

where $v_{1}$ is the person's velocity.

$m_{1}$ and $m_{2}$ are the respective masses.

Here,

→If boat is large, $m_{2}$ is large.

→In small boats with small mass, the effect is much smaller.

Here, there are 2 cases actually:

(I)

→If the person steps off the front of sailboat, which weighs about the same as the person, from point of view of an observer on the shore, person moved half as fast as the person would normally, fell short of dock and went in water.

(II)

→If the person step off the side of sailboat, then the person has less chance of getting wet. Person still transfer same amount of momentum to it, but the hulls won't move so easily sideways. The momentum will be transferred to the water, to the entire planet, as a result.

→Since it is so massive no one notices and as soon as you reach water, the momentum is transferred back again so that entire sum of momentum of the planet plus boat remains constant.

→ As the person jumps there is a friction between person's foot and the part of the boat the person is jumping off. This transfer the force(allowing the person to jump forward) to the boat propelling it backwards.

;)

Hope it helps

Comment if you need to clear anything