Safety features reduce injury by increasing the time over which momentum changes

Newton's Laws & Momentum — AQA A-Level Physics

From $F = \Delta p / \Delta t$: for the same change in momentum, increasing Δt decreases the force.
Crumple zones deform in a controlled way, increasing the time for the vehicle to stop.
Seat belts stretch slightly, increasing the time for the passenger's momentum to reach zero.
Airbags provide a soft cushion, further increasing contact time.
In sport: a cricket fielder draws their hands back when catching to increase contact time and reduce the force on their hands.
Follow-through in football increases the contact time with the ball, transferring more momentum.

Examiner Tips and Tricks

When explaining safety features, always link back to $F = \Delta p / \Delta t$.
State: same change in momentum, increased time, therefore reduced force, therefore reduced risk of injury.