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phys: conservation of momentum?

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eggy 2020-11-11 12:21:34 -05:00
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@ -508,6 +508,14 @@ As momentum is a **vector**, it must have a direction, and these differences in
!!! example !!! example
Bouncing balls change direction, so one of the velocities is in a direction opposite of the other. Bouncing balls change direction, so one of the velocities is in a direction opposite of the other.
### Conservation of momentum
Assuming there are no external forces, or if they are negligible, momentum between two objects must be conserved:
$$\Sigma\vec{P}_i=\Sigma\vec{P}_f$$
When two objects collide, their momentums must be equal and opposite if they travel in opposite directions:
$$-\Delta\vec{P}_A = \Delta\vec{P}_B$$
### Impulse ### Impulse
Impulse is the change in momentum of an object because of a force. It is expressed mathematically as $\vec{J}$, and is also represented in Newton seconds. Impulse is the change in momentum of an object because of a force. It is expressed mathematically as $\vec{J}$, and is also represented in Newton seconds.