What is the action force in figure 4?.
k) Which system exerted the action force? What is the reaction force?
m) Which system exerted the reaction force?
n) How will you describe the direction of the action-reaction forces in figure 4?
o) How will you describe the magnitude of action-reaction forces?
(hint: compare the length of the arrows exerted by the object to another.)
p) With all of these, how can you describe what happens between two interacting systems?

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