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Old 10-05-2012, 01:48 PM   #61
Arby911
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Quote:
Originally Posted by oneblackened

OP: Acceleration.


You sure? Seems several folks above disagree?
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Old 10-05-2012, 01:57 PM   #62
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Quote:
Originally Posted by Arby911
You sure? Seems several folks above disagree?

It's velocity, for crying out loud.

I'm a third year physics student, listen to me.
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Old 10-05-2012, 02:10 PM   #63
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This thread has made me realize just how much calculus and physics I've forgotten. It's a little sad
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Old 10-05-2012, 02:11 PM   #64
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Quote:
Originally Posted by magnus_maximus
It's velocity, for crying out loud.

I'm a third year physics student, listen to me.


I'm not arguing the point, I'm asking oneblackened if he/she/it is sure?



And I'm a left-handed insomniac twice removed on my mother's side...unprovable credentials mean shit on the internet...
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Old 10-05-2012, 02:27 PM   #65
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Quote:
Originally Posted by MAC2322


Forgive the red marker, I'm all out of other colors.

Anyway, as you can see from the graphs, Velocity is the only quantity whose sign changes. I avoided using dx/dt and dv/dt for velocity and acceleration respectively since I doubt your Physics class is Calculus-based, but for those of you who do know Calc I, derivatives are what I was approximating with my Δy/Δt and Δv/Δt.

I also marked the time t1 at which the object reaches its highest point so you could see how different quantities are changing (or not changing) at that time.


This↑↑↑
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Old 10-05-2012, 03:59 PM   #66
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Just leave the feckin ball where it is and eat something.

Last edited by kertets : 10-05-2012 at 04:01 PM. Reason: dont like this ******
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Old 10-05-2012, 04:12 PM   #67
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Quote:
Originally Posted by Arby911
I'm not arguing the point, I'm asking oneblackened if he/she/it is sure?



And I'm a left-handed insomniac twice removed on my mother's side...unprovable credentials mean shit on the internet...



Okay then.
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Old 10-05-2012, 04:24 PM   #68
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Only velocity...

position changes within the range of 0 and max distance (which is postivie)

velocity starts out upward, shrinks, becomes null at max height, and augments negatively (downard vector)

acceleration is always downward, by which I mean gravity, so contrary to the starting motion and negative at all times...


Was an expert really needed for this?
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Old 10-05-2012, 04:27 PM   #69
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Quote:
Originally Posted by Metallica1554
The answer is velocity because it is a vector quantity, hence speed and direction are taken into account. The direction that the ball is travelling in changes throughout the flight, so on the way back down the velocity becomes negative.




well done well done.
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Old 10-05-2012, 04:29 PM   #70
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^ acceleration is also a vector quantity, it's just unchanged in this case (assuming there's no wind resistance)

edit: even wind resistance would not invert the accel. sign, just diminish or increase it's value a bit
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