When friction acts between objects, the most common observation is that they slow down, assuming the object was moving in the first place. Friction also causes heat and wear (causes things to wear out).

An example of this is on a bike:

When the brakes are applied on a bike, brake pads squeeze the wheel, or a brake disk, and the bike slows down.

The wheels get hot however, as there is a lot of friction acting between the wheels and the brake pads to make the bike slow down.

As you pedal your bike along, the chain will wear out as it is rubbing on the gear mechanism as you peddle.

After a number of miles, the chain will have to be replaced or it is at risk of snapping as it worn out.