A background check is required of all applicants for the above licenses or. certificates. The following is required prior to going to Greeley/Weld Criminal. Justice Records Section, 1551 N. 17th Avenue, Greeley, CO for the background. check.
Friction is a force that acts against a moving object to slow it down. A type of friction is air resistance. Friction opposes the direction in which the object is moving, causing the object to decrease in speed, or stop all together.
Sliding friction is stronger when an object is stationary (this is called static friction) than when the object is in motion (this is called kinetic friction). When trying to move a box, it is often harder to get the box moving than it is to keep the box in motion.