Force is simply, an interaction of an object to another by a push or pull. Friction force is when an object wields force by two objects being pressed together; it may also oppose the object’s direction. This force has two types: sliding and static friction. Sliding friction is simply the force exerted when an object slides in a surface. Static friction is when both objects are at rest and an external force affects and creates a motion of one of the objects causing that object to create a motion to the other.