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Re: i think my physics teacher is stupid

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Coinman001 is not online. Coinman001
Joined: 10 Apr 2012
Total Posts: 56149
30 Sep 2015 08:04 PM
so today we were doping acceleration u know delta v/t

so we have this problem

a truck hits the break and goes from 45 m/s to 0 m/s in 5 seconds

a = (-) 9m/s^2

then the question says how fast is car after 1 s 2s 3s 4s 5s

she says the answer are as follows;
1 second = -9m/s
2 second = -18 m/s
3 second = -27 m/s
4 second = -36 m/s
5 second = -45 m/s
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Conjugator is not online. Conjugator
Joined: 26 Nov 2009
Total Posts: 23082
30 Sep 2015 08:06 PM
you guys say a = 9m/s^2?

we round to 10


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Conjugator is not online. Conjugator
Joined: 26 Nov 2009
Total Posts: 23082
30 Sep 2015 08:06 PM
oh ignore that comment lol, I thought we were talking about the general acceleration due to gravity


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Coinman001 is not online. Coinman001
Joined: 10 Apr 2012
Total Posts: 56149
30 Sep 2015 08:09 PM
is that the right answer

its uniformaly decelarating

so wouldnt it be

after 1 second its going 36m/s no -9m/s
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Conjugator is not online. Conjugator
Joined: 26 Nov 2009
Total Posts: 23082
30 Sep 2015 08:10 PM
after 1 second velocity = 36m/s

2 seconds velocity = 27m/s

etc.

Dunno what she is doing


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Coinman001 is not online. Coinman001
Joined: 10 Apr 2012
Total Posts: 56149
30 Sep 2015 08:10 PM
i bet she has been teaching it wrong for 15 years
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Iceblaster500 is not online. Iceblaster500
Joined: 23 Jun 2011
Total Posts: 16189
30 Sep 2015 08:11 PM
technically it is right
but that's bad logic
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supper828 is not online. supper828
Joined: 06 Feb 2010
Total Posts: 6735
30 Sep 2015 08:19 PM
uh.....

time to transfer out of that downie brownie school


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MrHoard is not online. MrHoard
Joined: 13 Dec 2014
Total Posts: 7646
30 Sep 2015 08:20 PM
well 45 -9 = 36

45 - 18 = 27

maybe that is wat she meant
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supper828 is not online. supper828
Joined: 06 Feb 2010
Total Posts: 6735
30 Sep 2015 08:21 PM
wait nvm she is actually right

she is teaching it in the sense that its -(x), which is taking away from the original speed

EX; her saying -9, means (x), which is the starting speed, -9, which is 36.

This leads up to 5, which is -45, and (x) - 45, x being 45, results in 0.


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Coinman001 is not online. Coinman001
Joined: 10 Apr 2012
Total Posts: 56149
30 Sep 2015 08:22 PM
no but she says the answer of the speed IS all negatives

shes not adding 45 m/s to any of the answers
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Iceblaster500 is not online. Iceblaster500
Joined: 23 Jun 2011
Total Posts: 16189
30 Sep 2015 08:23 PM
tell her to draw a picture of that LOL
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FatalDesires is not online. FatalDesires
Joined: 02 Jul 2011
Total Posts: 17945
30 Sep 2015 08:24 PM
Uhmmm I don't see how she's stupid. Looks right to me.
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Coinman001 is not online. Coinman001
Joined: 10 Apr 2012
Total Posts: 56149
30 Sep 2015 08:25 PM
how can the truck be going -45m/s
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supper828 is not online. supper828
Joined: 06 Feb 2010
Total Posts: 6735
30 Sep 2015 08:25 PM
unless she states that the time after (x) seconds is the net speed, she is right.


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Iceblaster500 is not online. Iceblaster500
Joined: 23 Jun 2011
Total Posts: 16189
30 Sep 2015 08:26 PM
guys its not acceleration
ITS SPEED OMG U CANT HAVE A NEGATIVE...
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FatalDesires is not online. FatalDesires
Joined: 02 Jul 2011
Total Posts: 17945
30 Sep 2015 08:26 PM
Actually I can see why you are confused. Your teacher is right but you still need to finish off the problem by plugging in the negatives. So since 1 second the truck slows down 9m/s it would be 45-9=36m/s
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1pool1 is not online. 1pool1
Joined: 07 May 2011
Total Posts: 9718
30 Sep 2015 08:26 PM
:l brain fart



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Conjugator is not online. Conjugator
Joined: 26 Nov 2009
Total Posts: 23082
30 Sep 2015 08:29 PM
she is right yeah

basically she is saying it like in each second the truck will be slowing down that many m/s

just saying it in a weird way.


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Iceblaster500 is not online. Iceblaster500
Joined: 23 Jun 2011
Total Posts: 16189
30 Sep 2015 08:30 PM
ur teacher makes it seem like a math class lol
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ExploreTheLocal is not online. ExploreTheLocal
Joined: 12 Mar 2010
Total Posts: 13577
30 Sep 2015 08:32 PM
those answers r correct lol

also my physics teacher was an imagineer for disney (that's what engineers were called there) and he was one of the engineers who made the tower of terror supposedly
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FatalDesires is not online. FatalDesires
Joined: 02 Jul 2011
Total Posts: 17945
30 Sep 2015 08:32 PM
Ice....if you've taken physics you know there's a lot of math involved.
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Iceblaster500 is not online. Iceblaster500
Joined: 23 Jun 2011
Total Posts: 16189
30 Sep 2015 08:34 PM
ap physics

duh its complicated math + logic
not just math
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Win11778n2 is not online. Win11778n2
Joined: 30 Nov 2013
Total Posts: 283
30 Sep 2015 08:37 PM
screw physics when you have the internet
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Conjugator is not online. Conjugator
Joined: 26 Nov 2009
Total Posts: 23082
30 Sep 2015 08:38 PM
omg ice what ap physics are u taking

im taking ap physics a mechanical based, or are you in a specific field?


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