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.
Friction. 1  Although wheels are great for rolling and reducing friction, they couldn't work without friction. 2  It would be really tough just to stand up without friction. 3  Friction can generate static electricity. 4  The harder two surfaces are pressed together, the more force it takes to overcome the friction and get them to slide.