The kind of surface also affects the force of friction. Sliding friction can be reduced by making surfaces slippery. Objects that roll have less friction than objects that slide. Push a book across a desk top. Then put some large marbles under the book and push it again.
Wheels are a common way to reduce friction.
Pulling a wagon over a concrete sidewalk is easier than pulling a slide over it. Pall bearings are rolling objects used to reduce friction. They help axles turn with ease. Axles are used in the wheels of many machines. For example, a bicycle has ball bearings in the wheels.