Fact 1: Friction causes an object to lose energy.

Fact 2: An object loses kinetic energy each time it hits a non-elastic surface.

Given the two facts above, answer the question "What does friction cause a mass to lose?" with the following options: 
- support
 - Energy
 - nutrients
 - weight
 - contents
 - Collagen
 - height
 - cartilage


 

  Energy       