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Change in momentum
When a force acts on an object that is moving, or able to moveΔ
F = mΔv / t
The equation linking force, change in momentum and time

F
The symbol for force

mΔv
The symbol for change in momentum

t
The symbol for time

Newtons (N)
The SI unit for force

Kilogram metres per second (kg m/s)
The SI unit for change in momentum
Seconds (s)
The SI unit for time
Force defined in terms of momentum
Force equals the rate of change of momentum
Force involved in collisions
The force of a collision is equal to the rate of change of momentum in bringing the vehicle to a stop
Car safety features that reduce the force of a collision
Seatbelts, airbags, crumple zones

How car safety features reduce the force of a collision
They increase the time taken for a collision to occur, which reduces the force for the same change in momentum