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#1
05-28-2006, 09:40 AM
 Unregistered Guest Posts: n/a
Kilograms Pounds and Newtons

Can a force have a magnitude measured in newtons? in pounds?...how about kilograms? Is kilograms both weight and mass on Earth?

When given a problem or situation to solve, should I
convert kilograms to pounds?
convert pounds to newtons?
convert kilograms to newtons?
#2
05-30-2006, 03:36 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,340 Rep Power: 12
Re: Kilograms Pounds and Newtons

Kilograms is a unit of mass only, and pounds is a unit of force only. Technically you cant convert directly between them.

But, kilogram-force (kgf) is equal to the gravitational force on a mass of 1 kilogram. You can convert kilogram-force to pounds, since a pound is the gravitational force on a mass of 1 pound.

Similarly, a pound-mass can be converted to and from kilograms.

Units of force:
pound
kilogram-force
Newton

Units of mass:
pound-mass
kilogram

The difference between force and mass is absolutely the most confusing thing about traditional weight systems. On Earth, the difference is moot, so its my thoughts to generally ignore the difference.

I think that if you are doing something where the difference between force and mass is important, then you know about the difference between force and mass. If you know about the difference then the conversion pages will not screw you up.
#3
08-12-2006, 08:07 PM
 Unregistered Guest Posts: n/a
Re: Kilograms Pounds and Newtons

Quote:
 Originally Posted by Unregistered Can a force have a magnitude measured in newtons? in pounds?...how about kilograms? Is kilograms both weight and mass on Earth? When given a problem or situation to solve, should I convert kilograms to pounds? convert pounds to newtons? convert kilograms to newtons?
pls inform that 45kilogram mean how much pounds ?
#4
08-13-2006, 03:06 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,340 Rep Power: 12
Re: Kilograms Pounds and Newtons

On Earth,

45 kilogram = 99.208 pound
#5
10-22-2006, 06:03 PM
 Unregistered Guest Posts: n/a

How many kilograms is 280 pounds?
#6
10-23-2006, 04:02 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,340 Rep Power: 12
Re: Kilograms Pounds and Newtons

280 pound = 127 kilogram

You can do that on the Weight/Mass conversion page.
http://www.onlineconversion.com/weight_common.htm
#7
01-11-2007, 03:12 AM
 Unregistered Guest Posts: n/a
Re: Kilograms Pounds and Newtons

Quote:
 Originally Posted by Unregistered pls inform that 45kilogram mean how much pounds ?
what is main differance between kg and kgf
#8
01-11-2007, 06:40 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,340 Rep Power: 12
Re: Kilograms Pounds and Newtons

kg is kilogram, a unit of mass.

kgf is kilogram-force, a unit of weight. It is the amount of force the Earth exerts on the mass of 1 kilogram.

While on Earth, 1 kilogram = 1 kilogram-force. Though technically a kilogram and a kilogram-force are different units and you cant directly convert between them, same with kilogram and pound. But while on Earth the difference does not matter so I usually tell people not to worry about it.

Its the most confusing part of traditional mass and weight systems. Scientists need to worry about it, but for the average joe its just there to confuse.
#9
03-20-2007, 02:44 PM
 Unregistered Guest Posts: n/a
Re: Kilograms Pounds and Newtons

Then how many newtons are in a kilogram?
#10
04-30-2007, 06:04 PM
 Unregistered Guest Posts: n/a
Re: Kilograms Pounds and Newtons

you have to consider gravity for what I think you are getting at, F=MA therefore 1 newton = 1kg * 9.81m/s on earth. Only works for things static, pushing towards earth's center.

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