# Unit of force is newton but

1. Nov 27, 2009

### otomanb

unit of force is newton but....

For is measured in Newton but in National Geographic Special documentaries, we have usually heard them using unit "pound" like to determine force like
1) 500 pound bite force of dog
2) 1800 pounds bite force of hippo
Why they measure force in pounds not in newton?
Thanks

2. Nov 27, 2009

### Pengwuino

Re: unit of force is newton but....

Maybe they feel their target audience is more comfortable using imperial units? or American units, whatever it's called.

3. Nov 27, 2009

### mikeph

Re: unit of force is newton but....

This doesn't even seem correct, lb is a unit of mass, not force. I guess it's just them being sloppy?

4. Nov 27, 2009

### Pengwuino

Re: unit of force is newton but....

Pound is a unit of force actually. The unit of mass is the 'Slug'.

5. Nov 27, 2009

### otomanb

Re: unit of force is newton but....

@ MikeyW
ya lbs and kg are the units of mass, in SI(system International) but might be they are using some kind or older system of measurements

6. Nov 27, 2009

### D H

Staff Emeritus
Re: unit of force is newton but....

When used without any qualifier or context, the term pound denotes a unit of mass, specifically the avoirdupois pound. The abbreviation for this unit is lb. The pound-force is a unit of force. The abbreviation for this unit is lbf. Some use lbm as an abbreviation for the pound (mass) for consistency with the use of lbf for the pound-force.

Saying "500 pound bite force of dog" is perhaps a bit sloppy, but the "500 pound-force bite force of dog" sounds stilted. It is obvious from context that the pound being talked about in this sentence is the pound force.

There are multiple units of mass called the pound. A pound of gold weighs less than a pound of feathers, for example. Precious metals are weighed with Troy weight while feathers (along with most other things) are weighed with the Avoirdupois system. A troy pound is 12 troy ounces; the avoirdupois pound is 16 avoirdupois ounces.

Confused? This diagram might help. Then again, it might not.

United States customary systems of measurement. Imperial units are different. A US gallon is not the same as an imperial gallon, for example.

See above. The slug is not an official unit.

7. Nov 27, 2009

### otomanb

Re: unit of force is newton but....

@above
thanks you my all brothers thanks for the answers. God bless you and keep helping.
:toman