Friction causes an object to lose energy, and friction occurs when two substances rub together. Given these facts, what causes an object to lose energy among the following options:
- wind and erosion
 - pressure differences.
 - refract or absorb.
 - heat is produced
 - electron transport
 - depress neuronal excitability
 - degrees Celsius
 - 2 substances rubbing together


 

        2 substances rubbing together 