Great Pyramid at Giza

[Archie Moses]

For something in a stationary position, they are fundamentally the same. We use the same terms for weight and mass (pound, kilogram, etc.) interchangeably.

Weight is a force measured by Newton's. Mass is measured by kilograms. The two should never be confused as the same stationary or not.

 

[LogGrad98]

Let's say I have a pillow whose mass is 2 feet squared. I also have a brick whose mass is 2 feet squared. Do they weigh the same?

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Size and mass are not the same. Mass and weight are not the same. Mass is a factor of volume and density of an object. Weight is a factor of mass and gravity.

 

[gandalfe]

For something in a stationary position, they are fundamentally the same. We use the same terms for weight and mass (pound, kilogram, etc.) interchangeably.

At least, on Earth, where those measurements were devised.

 

[gandalfe]

Let's say I have a pillow whose mass is 2 feet squared. I also have a brick whose mass is 2 feet squared. Do they weigh the same?

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Mass isn't measured in units of length.

 

[Deleted member 95]

Mass isn't measured in units of length.

Mine is

 

[LogGrad98]

Mine is

Like a gun....9 mm

 

[lauriandres]

Let's say I have a pillow whose mass is 2 feet squared. I also have a brick whose mass is 2 feet squared. Do they weigh the same?

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I do not want to be a smarta** (or i miss sarcasm in your post), but do they really teach physics in US schools that way? I.e that you measure mass/weight with square feet instead of pounds/kilograms? Shouldn't 2 feet squared mean an area size and you actually mean imply that the weight is different between the same size pillow and brick?

 

[fishonjazz]

I do not want to be a smarta** (or i miss sarcasm in your post), but do they really teach physics in US schools that way? I.e that you measure mass/weight with square feet instead of pounds/kilograms? Shouldn't 2 feet squared mean an area size and you actually mean imply that the weight is different between the same size pillow and brick?

No.
I didn't graduate from my high school.
I don't know ****

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[Gameface]

Am I missing something here? What's so funny about calculating weight from mass?

How did they determine the mass? He says it like it's some obvious thing "We know the weight because we can calculate it based on the mass" but neither is easier to determine and you'd generally use the same method to determine either one while standing still on planet earth.

I mean maybe he means they know the mass of granite so they are basing the weight on actual volumetric calculations... It was still a stupid thing for him to say IMHO.

 

[Jazz Spazz]

I do not want to be a smarta** (or i miss sarcasm in your post), but do they really teach physics in US schools that way? I.e that you measure mass/weight with square feet instead of pounds/kilograms? Shouldn't 2 feet squared mean an area size and you actually mean imply that the weight is different between the same size pillow and brick?

Why not? Something that is massive has to do with it's size, amirite?

 

[Deleted member 5000]

 

[One Brow]

Weight is a force measured by Newton's. Mass is measured by kilograms. The two should never be confused as the same stationary or not.

So, how do you measure mass, in a distinct manner from weight? I'm only aware of methods using acceleration.