- #1

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eg: Force

Pressure

Energy (using W.D.= force x distance)

Thankyou for your time.

- Thread starter Noxman
- Start date

- #1

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eg: Force

Pressure

Energy (using W.D.= force x distance)

Thankyou for your time.

- #2

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The Bob (2004 ©)

P.S. I guess someone else will understand immediately but I am afraid I do not.

- #3

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I think I know what Noxman wants.

You can derive any particular thing such as Energy and Pressure etc in fundamental units. The key is just to break them down. For example.

For Energy we know that W.D = F * d

d is distance measured in meters.

Force is measured in Newtons but this is not a fundamental unit....

So:

F = m * a

m is in Kg and a is acceleration and so in units of [tex]ms^-2[/tex]

So units of W.D. => Energy or Joules = [Kg] [ [tex]m^2s^-2[/tex] ]

this should put you on the right track to do pressure by yourself.

You can derive any particular thing such as Energy and Pressure etc in fundamental units. The key is just to break them down. For example.

For Energy we know that W.D = F * d

d is distance measured in meters.

Force is measured in Newtons but this is not a fundamental unit....

So:

F = m * a

m is in Kg and a is acceleration and so in units of [tex]ms^-2[/tex]

So units of W.D. => Energy or Joules = [Kg] [ [tex]m^2s^-2[/tex] ]

this should put you on the right track to do pressure by yourself.

Last edited:

- #4

mukundpa

Homework Helper

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gives dimensions of F

[F] = [M] [M^0 LT^-2] = [M L T^-2]

hence W = F . s gives

[W] = [M L T^-2] [L] = [M L^2 T^-2]

do you want this??

- #5

HallsofIvy

Science Advisor

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The "fundamental" units are: length, mass, time, charge, etc. Other units are "manufactured" from them as others have indicated:

velocity= distance/time,

acceleration= distance/time^{2}, etc.

In the MKS system, we measure length in meters, mass in kg., time in seconds so the "unit" of speed is m/s, acceleration m/s^{2} (which have no separate name), force (from F= ma) kg-m/s^{2} (the "Newton"), energy (from either KE= (1/2)mv^{2} or work= distance*force) kg-m^{2}/s^{2} (the Joule).

velocity= distance/time,

acceleration= distance/time

In the MKS system, we measure length in meters, mass in kg., time in seconds so the "unit" of speed is m/s, acceleration m/s

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