Fact 1: Pushing on the pedals of a bike cause that bike to move.

Fact 2: Wheels reduce friction with the floor to help cars move.

Given the two facts above, answer the question "pushing on the pedals of a bike cause what?" with the following options: 
- electromagnetic energy
 - Pollution
 - friction reduction
 - kinetic energy
 - decreases its bodily water
 - mechanical
 - get started
 - Heart rate


 

   friction reduction      