Do helmets really protect against a crash?

Kimmie Troutt/ Maddie Clavin/ Kennedy/ 5th/ 5/5/2014

Most people say helmets may a very big and important difference in bike riding safety, but when you think about it, does it really? They actually do. When something hits it, or a big impact is put on on your head, the helmet acts a shock absorber. For example, a guy was riding his bike, and a car going at a speed of 70 miles per hour hit him in the back of the head with the wing mirror. The helmet absorbed the force of the kinetic energy. The guys head was still hurt but definitely not as majorly as it it would have been without a helmet. The velocity of the car probably would have killed him. The kinetic energy of the car was converted to potential when you crash. The bike rider had chemical energy, then potential energy, then kinetic energy. Many bike riders say they have been saved by helmets.