Whiplash is a neck injury due to forceful, rapid back-and-forth movement of the neck, like the cracking of a whip. Whiplash is commonly caused by rear-end car accidents. But whiplash can also result from sports accidents, physical abuse and other types of traumas, such as a fall.
https://www.mayoclinic.org/diseases-conditions/whiplash/symptoms-causes/syc-20378921