Fact 1: Friction causes the temperature of an object to increase.

Fact 2: When a fire breaks out in a home, the temperature in the room increases.

Given the two facts above, answer the question "Friction can cause fires to break out in a home due to what?" with the following options: 
- heating liquids
 - wind speed
 - temperature
 - centripetal force
 - wire placement
 - friction
 - cigarettes
 - heat energy


 

   temperature      