# The Naked Scientists Forum

### Author Topic: how do you calculate the weight of an object if you know its mass in kilograms?  (Read 8042 times)

#### brstamper

• Jr. Member
• Posts: 23
##### how do you calculate the weight of an object if you know its mass in kilograms?
« on: 10/05/2008 01:54:07 »
How do you calculate the weight of an object if you know its mass in kilograms?

#### Supercryptid

• Hero Member
• Posts: 606
##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #1 on: 10/05/2008 04:38:39 »
Simple enough. Weight is the force created between two objects that have mass. In Earth's gravity at sea level, 1 kilogram of mass equals about 2.2 pounds of weight. On other planets, this would differ. On the Moon, there is about 1 sixth of Earth's gravity. Therefore, an object with 1 kilogram of mass would weigh about 0.367 pounds.

#### SquarishTriangle

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##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #2 on: 10/05/2008 05:38:42 »
Isn't weight measured in Newtons?

Force (weight) is approximately 9.8 times the mass in kilograms.

#### brstamper

• Jr. Member
• Posts: 23
##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #3 on: 10/05/2008 14:34:41 »

Simple enough. Weight is the force created between two objects that have mass. In Earth's gravity at sea level, 1 kilogram of mass equals about 2.2 pounds of weight. On other planets, this would differ. On the Moon, there is about 1 sixth of Earth's gravity. Therefore, an object with 1 kilogram of mass would weigh about 0.367 pounds.

#### brstamper

• Jr. Member
• Posts: 23
##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #4 on: 10/05/2008 14:35:07 »
Isn't weight measured in Newtons?

Force (weight) is approximately 9.8 times the mass in kilograms.
Thank you!

#### lyner

• Guest
##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #5 on: 10/05/2008 23:31:48 »
Imperial never really got the mass weight thing sorted.
Pounds weight and pounds force and poundals, ergs dynes Owch.
SI makes it simple. You must NEVER have a weight of 1.5kg except when you go shopping for potatoes. I was once asked to leave when I asked for 20Newtons of apples.
Weight is a force and is measured in Newtons always (except in a shop).
Mass is force/acceleration and is measured in kg.
Funny thing.
1kg weighs 10N when you are 14
1kg weighs 9.8N when you are 17
and
1kg weighs 9.81N when you grow up

Now that's standardisation?
And PI = 22/7, I'm told

#### DoctorBeaver

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• A stitch in time would have confused Einstein.
##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #6 on: 11/05/2008 00:19:01 »
Imperial never really got the mass weight thing sorted.
Pounds weight and pounds force and poundals, ergs dynes Owch.
SI makes it simple. You must NEVER have a weight of 1.5kg except when you go shopping for potatoes. I was once asked to leave when I asked for 20Newtons of apples.
Weight is a force and is measured in Newtons always (except in a shop).
Mass is force/acceleration and is measured in kg.
Funny thing.
1kg weighs 10N when you are 14
1kg weighs 9.8N when you are 17
and
1kg weighs 9.81N when you grow up

Now that's standardisation?
And PI = 22/7, I'm told

#### Bored chemist

• Neilep Level Member
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##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #7 on: 11/05/2008 13:59:46 »
It makes sense to order apples by mass because that's what you actually want. If you were on the moon would you eat a larger number of apples just because they weighed less?

#### lyner

• Guest
##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #8 on: 11/05/2008 15:17:22 »
agreed but they don't ask you what mass you want and nor do your friends ask you what your mass is. The word everyone uses is 'weight', which varies from place to place.

#### The Naked Scientists Forum

##### how do you calculate the weight of an object if you know its mass in kilograms?
« Reply #8 on: 11/05/2008 15:17:22 »