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gcombina

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A physics student in a hot air balloon ascends vertically at constant speed. Consider the following four forces that arise in this situation:

F1 = the weight of the hot air balloon F3 = the force of the student pulling on the earth

F2 = the weight of the student F4 = the force of the hot air balloon pulling on the student

8. Which one of the following relationships concerning the forces or their magnitudes is true?

(a) F4 > F2 (c) F4 > F1 (e) F3 = –F4

(b) F1 < F2 (d) F2 = –F4

Ok I know the answer is (d) because the forces form a pair someone told me but I don't see they form a pair, do they? and why do we have -F4 (I thought the normal force is positive as the balloon is pulling student up the air)

F1 = the weight of the hot air balloon F3 = the force of the student pulling on the earth

F2 = the weight of the student F4 = the force of the hot air balloon pulling on the student

8. Which one of the following relationships concerning the forces or their magnitudes is true?

(a) F4 > F2 (c) F4 > F1 (e) F3 = –F4

(b) F1 < F2 (d) F2 = –F4

Ok I know the answer is (d) because the forces form a pair someone told me but I don't see they form a pair, do they? and why do we have -F4 (I thought the normal force is positive as the balloon is pulling student up the air)

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