Weight Scaling: Gravitational & Normal Force Balance

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The discussion centers on the relationship between gravitational force and normal force, particularly in the context of how bathroom scales measure weight. It emphasizes that weight is the gravitational force exerted by Earth, and when standing still, the normal force exerted by the scale equals this gravitational force, resulting in equilibrium. Participants clarify that the scale measures the normal force, which corresponds to the individual's weight. The conversation also highlights the distinction between Newton's Third Law and the application of Newton's Second Law in this scenario. Ultimately, the mechanics of weight measurement through scales are explained through the balance of these forces.
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Every action has equal and opposite action.
There is gravitational force and it pulls us towards it center and A FORCE FROM EARTH is being applied on our body.This is supporting force or Normal force.

Weight is the force of gravity applied on our body by Earth and If Earth pulls by X Newton of energy then a force from Earth is also coming of X Newton.
when we stand on Bathroom Scale than our weight is shown by scale .
HOW?
Gravitational force+ Normal force = 0
Then how weight is scaled.
 
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DhruvKumar said:
Every action has equal and opposite action.
There is gravitational force and it pulls us towards it center and A FORCE FROM EARTH is being applied on our body.This is supporting force or Normal force.

Weight is the force of gravity applied on our body by Earth and If Earth pulls by X Newton of energy then a force from Earth is also coming of X Newton.
when we stand on Bathroom Scale than our weight is shown by scale .
HOW?
Gravitational force+ Normal force = 0
Then how weight is scaled.


I don't know how the bathroom scale works, but you can use a spring and see the length of compression and know your weight since the force applied by the spring is proportional to the compression length
 
Mr.louis please read my question and understand it ,then give any answer.

According to Newton's Third Law,
Gravitational force+ Normal force = 0
Then how weight is scaled. As we know Weight is Gravitational force applied on a body by earth.
 
DhruvKumar said:
Mr.louis please read my question and understand it ,then give any answer.

According to Newton's Third Law,
Gravitational force+ Normal force = 0
Then how weight is scaled. As we know Weight is Gravitational force applied on a body by earth.


Taking downward as positive
Your equation should be,
Gravitational force - Normal force = 0

As explained by Mr. Lois.
The spring in the scale is compress and the force is -kx.
It is scaled according to x.
 
DhruvKumar said:
According to Newton's Third Law,
Gravitational force+ Normal force = 0
The downward gravitational force (your weight) and the upward normal force are not Newton's third law 'action/reaction' pairs. They happen to add to zero because you are in equilibrium--not accelerating. This is an application of Newton's 2nd law, not the third.
Then how weight is scaled. As we know Weight is Gravitational force applied on a body by earth.
What the scale measures is the normal force it exerts. Which, in this case, happens to equal your weight.
 

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