My name is Alexander FufaeV and here I will explain the following topic:

# Conservation of Momentum

## Formula

What do the formula symbols mean?

## Velocity of the first body (before)

Unit
Velocity of the first body before the collision with the second body. The first body has the momentum $$p_1 = m_1 \, v_1$$.

## Velocity of the second body (before)

Unit
Velocity of the second body before the collision with the first body. The second body has the momentum $$p_2 = m_2 \, v_2$$.

## Mass of the first body

Unit
Here it is assumed that the mass of the first body remains the same before and after the collision.

## Mass of the second body

Unit
Here it is assumed that the mass of the first body remains the same before and after the collision.

## Velocity of the first body (after)

Unit
Velocity of the first body after the collision with the second body.

## Velocity of the second body (after)

Unit
Velocity of the second body after the collision with the first body.
Explanation

## Video

Conservation of momentum is one of the laws of conservation in physics and applies when no force acts on a particle:

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The Newton's 2nd law states the following:

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With Eq. 1 the time derivative of the momentum disappears:

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If the pulse does not change over time, it is constant:

Formula anchor