TBR chapter 2 Physics

[pitupua]

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Question on Passage I of the Review Questions in Chapter 2 of TBR Physics.

8. If a moon orbited a planet in uniform circular motion, the force of gravity from the planet acting on the moon:

a. would do work on the moon, otherwise it would cease to orbit the planet
b. would do no work on the moon, otherwise the moon would change orbital speed
c. would do work on the moon keeping it constant
d. would do no work on the Moon, which changes the orbital speed of the Moon


is it me or do b and c say practically the same thing...? I don't understand then why B is the better choice...

 

[Sarvish]

Question on Passage I of the Review Questions in Chapter 2 of TBR Physics.

8. If a moon orbited a planet in uniform circular motion, the force of gravity from the planet acting on the moon:

a. would do work on the moon, otherwise it would cease to orbit the planet
b. would do no work on the moon, otherwise the moon would change orbital speed
c. would do work on the moon keeping it constant
d. would do no work on the Moon, which changes the orbital speed of the Moon


is it me or do b and c say practically the same thing...? I don't understand then why B is the better choice...

B and c are different in that b means the planet does no work on the moon while c says the planet does work on the moon. Work is a dot product, since the moon is moving perpendicular to the direction of the gravitational force, no work is being done

 

[pitupua]

Omg i swear to god, i read the question like a thousand times and i could have sworn C said "no work" too. I'm dumb. But thank you very much!