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JB 924
Joined: 03 Apr 2006 Posts: 607 Location: Hessen, Germany

Posted: Tue Jun 06, 2006 3:31 pm Post subject: Fc=mv2/r 


I need help for school. I need to know how to rearange the formula for centripetal force.
I'm an idiot at math and have no clue how to rearrange formulas anymore.
The formula is
F=mv(squared)/r
I would like to know how to do it for velocity and the radius and mass.
Tried googling but none of them show the other ones. And I can't figure
out how to rearrange from the instructions they give.
Thanks a lot, guys
Last edited by JB 924 on Tue Jun 06, 2006 4:29 pm; edited 1 time in total 

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seanski44
Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

Posted: Tue Jun 06, 2006 3:56 pm Post subject: Re: Fc=mv2/r 


JB 924 wrote:  I need help for school. I need to know how to rearange the formula for centripetal force.
I'm an idiot at math and have no clue how to rearrange formulas anymore.
The formula is
F=mv(squared)/r
I would like to know how to do it for velocity and the radius and mass.
Tried googling but none of them show the other ones. And I can't figure
out how to rearrange from the instructuins they give.
Thanks a lot, guys 
OK, a while since I did maths, but here goes...
if F= MV(Squared)/R
You can move the R over to the other side of the equation by timesing both sides by R  thus:
FR=MV(squared)
or move the V over to the other side by dividing both sides by V(squared) thus:
F/V(squared) = M/R
so to get this just for radius (assuming R is radius) simply continue this  to get the R on its own, you need to divide both sides by M, so:
F/MV(Squared) = 1/R
Hope that helps  and anyone else, feel free to correct me...
etc etc...
so _________________ 1998 BMW Z3 2.8 arctic silver & red
1981 168HP 931 S2 blue/tan leather  SOLD
1985 121HP 924 2.0l na modded  SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD 

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steeny
Joined: 24 Nov 2005 Posts: 319 Location: Brisbane, Australia

Posted: Tue Jun 06, 2006 3:58 pm Post subject: 


alright, i think i have these right. someone else can check
for radius
multiply by R and divide by F
to get R = mv(sq)/F
for m, then
multiply by R, divide by v(sq) to get
m = fr/v(sq)
and for V, multiply by R, divide by M and take the Square root
v= Sqrt(fr/m)
i think this is all OK. if not, sorry, maths was a while ago for me.
cheers _________________ 1978 924 N/A
she's gone..... 

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tj924
Joined: 15 Jul 2004 Posts: 957 Location: Toowoomba, Queensland, Australia

Posted: Tue Jun 06, 2006 4:04 pm Post subject: 


steeny wrote:  alright, i think i have these right. someone else can check
for radius
multiply by R and divide by F
to get R = mv(sq)/F
for m, then
multiply by R, divide by v(sq) to get
m = fr/v(sq)
and for V, multiply by R, divide by M and take the Square root
v= Sqrt(fr/m)
i think this is all OK. if not, sorry, maths was a while ago for me.
cheers 
Same answers I came up with independently, so it MUSt be correct! _________________ TJ
Silver '82 924 NA 5Speed Manual 

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JB 924
Joined: 03 Apr 2006 Posts: 607 Location: Hessen, Germany

Posted: Tue Jun 06, 2006 4:26 pm Post subject: 


Thanks so much, guys!!! 

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sequential
Joined: 18 Nov 2005 Posts: 501 Location: BANNED

Posted: Wed Jun 07, 2006 6:26 pm Post subject: 


tj924 wrote:  steeny wrote:  alright, i think i have these right. someone else can check
for radius
multiply by R and divide by F
to get R = mv(sq)/F
for m, then
multiply by R, divide by v(sq) to get
m = fr/v(sq)
and for V, multiply by R, divide by M and take the Square root
v= Sqrt(fr/m)
i think this is all OK. if not, sorry, maths was a while ago for me.
cheers 
Same answers I came up with independently, so it MUSt be correct! 
Not really both of you guys went to the same school in australia _________________ 928 gts prototype
baby blue engine block
steam in 1,2,3,4 sometimes
cold star issues while on stands
112 whp with new 4 valve head and MIS 2 

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