Friction is a force that opposes the motion of objects; friction can cause objects to slow down. ... Air resistance causes moving objects to slow down.

Does friction slow down a moving object?

Friction can slow things down and stop stationary things from moving. In a frictionless world, more objects would be sliding about, clothes and shoes would be difficult to keep on and it would be very difficult for people or cars to get moving or change direction.

Does friction affect speed?

How does Friction affect speed? ... Friction tends to make an object move along with its neighbors. For example, if a big wind is blowing, friction between it and a leaf on the ground will get the leaf moving, speeding it up. But if a leaf is falling on a still day, friction with the air will slow it down.