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Started By
Message
Most Americans don't know the answer to this question
Posted on 4/18/16 at 5:51 am
Posted on 4/18/16 at 5:51 am
If a pen is dropped on a moon, will it:
A) Float away
B) Float where it is
C) Fall to the surface of the moon
D) All of the above
LINK
Physics 324 - Modern Physics for Engineers responses
Physics 111 - First semester Non-calculus Physic
OT Do you know the answer thread
A) Float away
B) Float where it is
C) Fall to the surface of the moon
D) All of the above
LINK
quote:
So a bunch of us TA's got together and gave our physics classes quizzes asking this question. Out of 168 people taking the quiz, 48 missed the question. The responses are below. Some people didn't write comments. The spelling and grammar were not changed, however, clarifying comments are enclosed in []'s.
Physics 324 - Modern Physics for Engineers responses
quote:
"A body is at rest tends to stay at rest, plus there's no gravity"
quote:
"The gravity of the moon can be said to be negligible, and also the moon's a vacuum, there is no external force on the pen. Therefore it will float where it is."
quote:
"The pen will float away because the gravitational pull of the moon, being approximately 1/6 that of the earth, will not be enough to cause the pen to fall nor remain stationary where it is. The gravatational pull of other objects would influence the pen"
Physics 111 - First semester Non-calculus Physic
quote:
"There is no gravitational force on the moon, the pen therefore has no weight so its mass has no effect on 'where it goes'. Plus, you know, there is no wind to blow the pen up there! =)"
OT Do you know the answer thread
quote:
"A pen ain't a feather, bro."
quote:
"Do all moons in the solar system have the same gravity as "our" moon? Flawed question. All answers could be in play? "
quote:
"Scruffy is right. The question implies an answer for all moons in the universe. There are cases where given bodies gravitational pulls might result in any of the answers A-C (think microgravity, to conceptualize)".
This post was edited on 4/18/16 at 9:35 am
Posted on 4/18/16 at 5:56 am to Placebeaux
C)
And it'll hit the ground at the same time as an anvil dropped at the same time.
And it'll hit the ground at the same time as an anvil dropped at the same time.
Posted on 4/18/16 at 6:02 am to dbeck
quote:
And it'll hit the ground at the same time as an anvil dropped at the same time.
A pen ain't a feather, bro. (I assume the comparison is to Earth.)
Posted on 4/18/16 at 6:03 am to Placebeaux
The moon has some gravity. An object would have to be launched with enough force to reach escape velocity to float away.
Posted on 4/18/16 at 6:04 am to Spock's Eyebrow
quote:
A pen ain't a feather, bro. (I assume the comparison is to Earth.)
Wth? Not sure if serious?
Posted on 4/18/16 at 6:04 am to Spock's Eyebrow
In the vacuum of space they would fall at the same rate.
Posted on 4/18/16 at 6:06 am to FreddieMac
quote:
quote: A pen ain't a feather, bro. (I assume the comparison is to Earth.) Wth? Not sure if serious?
You could probably get him with the old what weighs more a pound of lead or a pound of feathers question.
Posted on 4/18/16 at 6:07 am to Placebeaux
No atmospheric conditions for weight to make a difference. Only gravity, so C is the answer.
Posted on 4/18/16 at 6:10 am to Placebeaux
C. The Moon's gravity is 1/6th G
Posted on 4/18/16 at 6:13 am to FreddieMac
quote:
Wth? Not sure if serious?
The question concerned "dropping a pen on the moon". That's a distance of 3-4 feet. It seemed ridiculous even on Earth to compare it to dropping an anvil from the same height. A feather, OTOH...
Posted on 4/18/16 at 6:18 am to CSATiger
quote:you sure?
C. The Moon's gravity is 1/6th G
Posted on 4/18/16 at 6:21 am to StringedInstruments
quote:
No atmospheric conditions for weight to make a difference. Only gravity, so C is the answer.
And I think if atmosphere were a factor, it would be safe to assume you're not in a tornado on Earth or deep inside Jupiter's clouds, say.
Posted on 4/18/16 at 6:26 am to FreddieMac
Spock's Eyebrow is Bill Nye the science guy
Posted on 4/18/16 at 7:13 am to Placebeaux
Let's go back to the same studio where the "Moon walks" were filmed and drop a pen to see.
ETA: It's called "sarcasm" people.
We went to the frickin' moon.
ETA: It's called "sarcasm" people.
We went to the frickin' moon.
This post was edited on 4/18/16 at 7:14 am
Posted on 4/18/16 at 7:27 am to Spock's Eyebrow
quote:
A pen ain't a feather, bro.
Posted on 4/18/16 at 7:33 am to Placebeaux
quote:
If a pen is dropped on [b]a[/b] moon,
In case you are wondering, the correct answer is (c). The moon has gravity just like the earth, only weaker.
Do all moons in the solar system have the same gravity as "our" moon?
Flawed question. All answers could be in play?
This post was edited on 4/18/16 at 7:34 am
Posted on 4/18/16 at 7:33 am to Placebeaux
Anyone who says anything else besides C should be taken out back and shot.
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