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.
No applied force, no reaction force. There are two types of friction: Static Friction and Kinetic Friction. Static Friction is the frictional force between two objects that are NOT moving relative to each other. It is the initial force that must be overcome in order for things to move. If the force trying to move the object is less than the force of static friction, the object cannot move. Kinetic Friction is the frictional force between two surfaces that ARE moving relative to each other (sliding along each other).