What are the ways to increase and reduce friction?

Answer:
Depends what you want to increase/decrease friction on. If is like a weight on the floor.. Then to increase the friction all you have to do is increase the weight, To reduce it you either reduce the weight or get a smoother surface, or maybe a cloth in-between the floor and the weight.
First answer by KevinSuarez. Last edit by KevinSuarez. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 2 [recommend question].