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When a car accelerates forward, the force causing the acceleration is
static friction
The free-body diagrams in Figure 7.16 in your textbook show two action/reaction pairs of forces. Why are forces n⃗ Tn→T and (F⃗ G)T(F→G)T not identified as an action/reaction pair?
Because forces in an action/reaction pair act on different objects
system
Collection of objects whose motion we want to analyze, the environment is objects external system
Interaction diagram
.
Propulsion
Force that a system with internal source of energy uses to drive itself forward.