“The key observation between two helmet/heads interacting at elastic and inelastic collisions is to minimize the acceleration of the brain by minimizing the transfer of momentum between the two colliding helmet/heads. If a helmet/head has an inelastic energy absorbing layer as an added soft layer surrounding a hard shell of a helmet, this extra soft layer will accomplish just such a reduced momentum transfer between the two helmet/heads. Both helmet/heads will have diluted forces transferring into the elastic brain. This is how the Guardian Cap works.” – McGill University Physics Review, “Newton’s Cradle: Colliding Football Helmets Physics 101”

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