Why is the momentum quantity needed?

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Think that a truck and a rickshaw are going at the same speed. You are asked to stop both. Which one should use more force to stop? Surely more force will be needed to stop the truck. Because even though the speed of both is the same, the mass of the truck is more, and therefore the inertia is more. That is why more force must be applied to stop it or change its inertia. That is, if the mass of an object is greater, its inertia is greater and more force is required to change its inertia.

Again assuming that two rickshaws of the same mass are moving at different speeds. If you are asked to stop two rickshaws, the faster rickshaw will need more force to stop it. Because even though the mass of both the rickshaws is equal, the speed of the rickshaw with higher velocity will be greater. That is why more force must be applied to stop it or change its inertia. That is, even if the velocity of an object is high, its inertia is high and more force is required to change its inertia.

Then we can see that the amount of inertia of an object or the amount of force-changing inertia depends on two quantities. They are mass and velocity. If we multiply the two momentum equations, which is called momentum. But we can say easily or in one word – the one with more momentum has more inertia or more force will be required to change the inertia. This is why we need the momentum equation.