- #1

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##F=ma = 2.3*424.3 [kg*m/s^2]##

In high school, I've never seen the teachers or textbooks write like this. How common is this is method? Assuming one keeps track of their units properly, I like this method because it feels more organized.

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- Thread starter WK95
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- #1

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##F=ma = 2.3*424.3 [kg*m/s^2]##

In high school, I've never seen the teachers or textbooks write like this. How common is this is method? Assuming one keeps track of their units properly, I like this method because it feels more organized.

- #2

Dick

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##F=ma = 2.3*424.3 [kg*m/s^2]##

In high school, I've never seen the teachers or textbooks write like this. How common is this is method? Assuming one keeps track of their units properly, I like this method because it feels more organized.

It's the usual thing to collect all of the units in a product together, for exactly the reason you cite. Do it, it's a good thing to do.

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PhanthomJay

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Thanks. I'll use this more knowing that its a proper practice. Just ot make sure i'm doing it right, is this correct in format?

##F=9.8m [m/s^{2}]##

What about for something like y = 59 - 4x?

Would I group the units in brackets after each term or at the end of the whole thing?

For example, would it be

##y = 59 [unit] - 4x[otherunit]##

##F=9.8m [m/s^{2}]##

What about for something like y = 59 - 4x?

Would I group the units in brackets after each term or at the end of the whole thing?

For example, would it be

##y = 59 [unit] - 4x[otherunit]##

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- #5

Dick

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Thanks. I'll use this more knowing that its a proper practice. Just ot make sure i'm doing it right, is this correct in format?

##F=9.8m [m/s^{2}]##

The format isn't terribly important, you don't need brackets. Just collect all of the units at the end like you did before, kg*m/s^2. I'm not sure what your example is. m[m/s^2] isn't the units of a force.

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Dick

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Thanks. I'll use this more knowing that its a proper practice. Just ot make sure i'm doing it right, is this correct in format?

##F=9.8m [m/s^{2}]##

What about for something like y = 59 - 4x?

Would I group the units in brackets after each term or at the end of the whole thing?

For example, would it be

##y = 59 [unit] - 4x[otherunit]##

End of the whole thing. If the two terms you are adding or subtracting have different units, then there is a mistake someplace. You can't add things with different units.

- #7

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Also, the example was just random numbers. The variable of x has units that would make "otherunit" into the "unit" but I didn't put down the units for x since it's still an unknown value.

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Dick

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Also, the example was just random numbers. The variable of x has units that would make "otherunit" into the "unit" but I didn't put down the units for x since it's still an unknown value.

Ok, fair enough. But using 'm' as a variable for mass when you are are also using 'm' to designate meters is asking for confusion. If you are collecting units, then use dimensionless quantities for the variables, like the numbers you used before. I.e. don't say mass=M. Say mass=M*kg. So M itself has no dimensions.

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