Mass or Weight? Balance or Scale?
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- Опубліковано 27 сер 2015
- Thanks for SHARING with your Fzx Teacher!
The distinction between mass and weight is extremely important in physics (Fzx). This video rolls through mass vs. weight and balance vs. scale and kilograms vs newtons, highlighting the constant confusion among them.
"How to a Mass Balance" - • How to Use a Mass Balance
"Using a Force Scale" - • How to Use a Force Scale
Science supply distributors are not without blame - scales are consistently used to measure mass. And yes, a balance can be calibrated with units of newtons and a scale with units of kilograms. The reason for this is the linear relationship represented by W=mg. They are not the same - and for the sake of sanity in Fzx - keep em separate.
![What is Mass Vs. Weight in Physics? - [1-5-11]](http://i.ytimg.com/vi/EBRTa8UGY2s/mqdefault.jpg)
alright we gotta fucking clear this up in society
I find it absurdly interesting that I have always been telling people that my weight is 55kg.
Everybody does it.
Idk why, but this video is hillarious. In a good way though XD
We laugh because it's funny, and we laugh because it's true.
Humanity will forever misspells Weight and Mass, Lead-Pencils and Graphite-Pencils, Credit Card and Debit card!!!!!!
that is great, but do you mean that all scales measuring weights by assuming that the acceleration of gravity is constant any where (9.807 meter per square meter)? coz you know that the acceleration of gravity differs according to your position on the earh(the distance between your position to the center of the earth) ... i hope you help me about this question .. thanks in advance for your help.
be better - The scale doesn’t care if you’re on the moon or Mars or Earth. The scale is designed to measure FORCES and weight is one type of force. If the scale is properly calibrated to force it’ll read the proper weight anywhere it can be used.
9Thanks for replying, but you know sir that weight is the product of multiplying the mass and the acceleration of gravity (w=m*g) , so the mass of any body will not be the same on the earth and the moon coz the acceleration of gravity is different from one place to the other,
so if it is designed to measure the weight (not the mass) it must measure the (g) or consider it as constant (9.807 m/sq.seconds) or whatever ...
and if the scale measure the weight (which is W=m*g), how it can ignore the acceleration of gravity (g)?
i hope you forgive me about my weakness in english ,,
and i hope u reply..
thanks bro
be better - scales do NOT measure weight. They measure force. Weight is the force of gravity on an object. A scale at rest or at a constant velocity up or down will read a number equal to the weight.
be better - the mass is the same no matter where you go but the weight changes. The scale doesn’t care what g is since it measures weight directly.
@@bebetter1272 I think what adds to the confusion here is that the measure of weight is a human made product for our daily earthly life of convenience. I think the way out of the mess and confusion is to see that how it works is that every scale is calibrated to tell you ("to read") exact equivalent to a standard 1kg (metric system of course,I'm not going to bother with the imperial here).
So when you step on a scale it doesn't bother with anything apart from what force is generated on it's surface and how does that translate to it's calibration (with standard 1kg weight under standard local conditions = average temperature and gravity on the surface of earth/generally refered to as a typical room conditions). Calibration is a mechanical process and once a device is calibrated it will mechanically respond as it is calibrated.
So the scale responds to the force applied and it does respond by the way of it's calibration..its process basically expresses the new force applied through the calibrated forces (a force equal to the calibrated 1kg will "read" as 1kg on the scale).
And so it is not a true representation of your mass, it is a representation of your mass which does not take into account the posible gravitational changes or fluctuations (these don't get translated correctly into the measurement of your mass given by the scale - the scale is only responding to the force-it is a man made mechanical device not a 'smart' device).
The scale was calibrated somewhere to recognise the force of a standardised 1kg weight as 1kg and it will display it's "weight" as 1kg (even tho we all know that weight is measured in newtons). It simply works with force applied and what kg number this force coresponds to within it's mechanical settings(digital scales included). It is confusing because of all the alternative inputs, however once you start from understanding what the scale is (simple/primitive mechanical device to measure force and give the reading in kilograms by comparison not equation) then you will slowly get to the clarity of it.
So the answer to what I think was your question is that the scale only responds to the force...it has no idea about your real mass...for that you would need to use other measuring devices (the balance scale would give a more accurate reading as it removes the confusing issue of gravity on Earth - obviously in space this would be also completely useless measurement device and one would have to start using more elaborate ways of measurement to tell a mass of an object)
Mind experiment:
Imagine you're standing on a scale and your friend has his hand on your shoulder and does press down on you with some force.
The scale will show a number in kilograms way bigger than the mass of your body and your friends hand is.
It will give you a representation of the weight (force) in kilograms (given it's calibration) that is applied to the surface of the scale and it will be completely unrelated to the mass of the object that is on the scale. The scale is a convenient yet simple tool built for the purpose and use under room conditions.
Nice
Another reason why people use weight and mass same is. We life or we are in planet earth and gravity is same everywhere in earth. And we don't know difference b/w them. But when we go into moon or outside our planet we realise difference b/w mass and weight. B/c gravity is weaker in moon. Isn't it?