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## Step 1: Algebra

F=G Mm/r^2

then

F r^2 = GMm

then

F r^2 / Gm = M

this new equation lets us put in the numbers and get the answer out. Do not fear letters in maths!

Physics, despite it's reputation is an amazing science and with not as much effort as you would expect you can make calculations on some very interesting/practical phenomena. In this instructable I intend to show you how to make and understand some of those calculations, a minimum of algebra is necessary but the rest i will explain here. Please note this is my first instructable, more will follow on topics such as basic electronics ( a simple electric shock device) and animation by computer ( using blender).

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Maths is crucial for solving the problems that will follow, you will need to understand standard index form numbers where you have Zx10^y this will give you a long number starting with z followed by y zeroes( 2.99x10^8=299000000), also you will need to be able to rearrange equations such as E=mc^2 into m=E/c^2 and more complex examples such as newton's law of universal gravitation. To do that for example if we wanted to find the mass of an object from already knowing what it's force upon us was, what our mass is and how far away it is we would do something like this. M is the objects mass, m is our own mass, G is a constant 6.67x10^-11 and r is how far we are from the object

F=G Mm/r^2

then

F r^2 = GMm

then

F r^2 / Gm = M

this new equation lets us put in the numbers and get the answer out. Do not fear letters in maths!

F=G Mm/r^2

then

F r^2 = GMm

then

F r^2 / Gm = M

this new equation lets us put in the numbers and get the answer out. Do not fear letters in maths!

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