The four are: there is a structure of each system, the position of each element could be determined by structure in a whole, there is structural laws in which exist and lastly, structure is considered to be real.
He asked to borrow the officers truck.
1. a force that opposes motion = friction
2. equal and opposite forces applied to the ends of an object = normal force
3. affects objects moving through air = air resistance
4. press the surfaces of static, or unmoving, objects together = tension
5. force of attraction between masses = gravity
6. force which involve charged atoms = electrical force
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