Friction is a type of force that resists motion. When a moving object encounters friction, it slows down. One way to reduce friction is to use a lubricant such as oil or grease, which makes a surface slippery so there is less resistance to movement. Just think how easy it is to slip on an oil slick or a puddle of water! In this worksheet, kids learn about friction by answering questions about the amount of friction in different situations.