The combat controller training program is as follows: Combat Control Screening Course, Lackland Air Force Base, Texas This 10-day screening course focuses on physical fitness with classes in sports physiology, nutrition, basic exercises, CCT history and fundamentals. Combat Control Operator Course, Keesler AFB, Miss.
Static or dynamic friction always act in a direction opposite to the impressed force. The dynamic friction does not need in any force. It is realy directed in opposit to the velosity. And the static friction can never be without the shearing force and it is always directed in opposit to it. However, you are right - dynamic friction forces can or slow down the movement of the body or accelerate it.
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).