* Kinetic Energy: The energy of motion is called kinetic energy. It's calculated with the formula: KE = 1/2 * mv^2 (where m is mass and v is velocity).

* Force and Energy: Impact force is directly related to the change in kinetic energy.

* Doubling Speed: If you double the speed (v), you square the velocity in the formula (v^2). This means you increase the kinetic energy by a factor of 2^2 = 4.

Therefore, doubling the speed increases the impact force by a factor of four.