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.
Kinetic friction is often an unbalanced force acting on moving objects. Thus, kinetic friction often changes the velocity of a moving object by slowing down the object. Static Friction Often, a force is applied to an object but does not cause the object to move. The object does not move because the force of static friction is balancing the force applied. Static friction can be overcome by applying a large enough force. As soon as an object starts moving, static friction has gone and has been replaced by kinetic friction. Look at Figure 4 to understand when static friction affects an object.