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Momentum
The product of mass and velocity

p = mv
The equation linking momentum, mass and velocity

p
The symbol for momentum

m
The symbol for mass

v
The symbol for speed and velocity

Kilogram metres per second (kg m/s)
The SI unit for momentum
Kilograms (kg)
The SI unit for mass

Metres per second (m/s)
The SI unit for speed or velocity
Conservation of momentum
The total momentum before an event is equal to the total momentum after the event in a closed system

Situations where momentum is conserved
Explosions and collisions
Collision
When two objects meet and interact

Explosion
When parts of a system separate and move apart

Total momentum before an explosion
Equal to zero because the parts of the system are stationary
How momentum is conserved after an explosion
The two parts of the system momentum that is equal is size but acts in the opposite direction so they cancel out