All factors must be considered when determining solutions to problems. A solution to one problem may create other problems. Today we will learn more about friction and how it occurs when machines do work. Friction is the force that resists the movement of one material over another material. Friction is produced when two materials rub against each other.
Friction produces heat.
Friction on wheels can be reduced by using lubricants such as oil, grease, or glycerin. Using smoother surfaces also reduces friction. Increase friction by using uneven or rough surfaces to generate greater pressure. Objects moved on smooth surfaces generate less friction than objects moved on rough surfaces. Friction increases the amount of force needed to move an object.