Question

How does friction affect an object's motion?

Answer 1

Friction tends to slow down an objects motion.

Explanation:

Friction is defined as
`"A force which opposes the motion of a moving body."`

Friction acts in a direction `Opposite` to the motion of the body.

For example,
When a box is slides over another box, due the the molecular interactions b/w the surfaces of the two boxes and the pits and bumps on them, friction is produced which tends to oppose the motion. .

Friction can be reduced by using lubricants.
For instance, there is more friction if a car moves over a dry road than when it moves over a wet road.

The energy to do work against friction is lost as heat.

(Note:this is the most basic answer which i have given according to the above asked question. You can ask @me for more details)