# Help, urgently needed in physics

• Nov 5th 2007, 01:50 AM
divinewisdom0218
Help, urgently needed in physics
Can someone teach how to solve formula manipulation/transformation in Physics??
• Nov 5th 2007, 03:34 AM
topsquark
Quote:

Originally Posted by divinewisdom0218
Can someone teach how to solve formula manipulation/transformation in Physics??

You are going to have to be more specific. What kind of problem(s) are you thinking about?

-Dan
• Nov 5th 2007, 05:25 AM
divinewisdom0218
E.G. S=Vot + 1/2gt^2 = Vo=S - 1/2gt^2 / T
Problem no.1: from the equation, A=at+v, determine the formula for a

Problem no.2: S=Vo t+ 1/2 at^, for Vo,a

PROblem no.3: v= Vot + at^2, for Vo,a
• Nov 5th 2007, 09:14 AM
topsquark
Quote:

Originally Posted by divinewisdom0218
Problem no.1: from the equation, A=at+v, determine the formula for a

You solve these the same way you would solve them if the A, t, and v are just numbers (which in reality they are.)

Step by step:
$A = at + v$

$A - v = at + v - v$

$A - v = at$

$\frac{A - v}{t} = \frac{at}{t}$

$a = \frac{A - v}{t}$

Quote:

Originally Posted by divinewisdom0218
Problem no.2: S=Vo t+ 1/2 at^2, for Vo,a

For $V_0$:
$S = V_0t + \frac{1}{2}at^2$

$S - \frac{1}{2}at^2 = V_0t + \frac{1}{2}at^2 - \frac{1}{2}at^2$

$V_0t = S - \frac{1}{2}at^2$

$\frac{V_0t}{t} = \frac{S - \frac{1}{2}at^2}{t}$

$V_0 = \frac{S}{t} - \frac{1}{2}at$

You solve for a.

-Dan