Why are their Safety Features in Cars and more?

-It is to Increase the Collision Time, which again Reduces the Deceleration and therefore the Force, which Reduces the Chance for Injury -Seat Belts will Stretch, Air Bags will slow you Down and Crumple Zones will well Crumple up Easily, making the Time Taken to Increase [Lowers Force and Acceleration] -Bike Helmets also has a Crushable Layer of Foam, which again Increase the Amount Time Taken for the Head to Stop. -Shin Pads also Deform when Hit, reducing the Deceleration and Force on your Leg.