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One students drew a free-body diagram and wrote a corresponding set of F=ma equations.
The triangle reminds me of the symbol for a point load in a free-body diagram, and the streamer through the middle would fit “Homes Agricultural Buildings Churches” centered in the ad.
Hint: 'free-body diagram' is the term you're looking for RH.
Within our theory, here is how we analyze the free-body diagrams.
Equilibrium and the construction of free-body diagrams