Table of Contents

Mass

Mass and weight

[begin chatgpt]

In a previous chat you gave the weight of an object
at an altitude of 2638 km as 4.9033 N.
Why did you use the unit of Newton instead
of kg for weight?
Can we convert Newtons to kilograms?

Great question! Let me explain.

Why Use Newtons for Weight?

Weight is the force exerted by gravity on an object, and force is measured in Newtons (N) in the SI system. By definition, weight (\( W \)) is given by:

\[ W = m \cdot g \]

where:

  • \( m \) is the mass of the object (in kilograms, \( \text{kg} \)),
  • \( g \) is the gravitational acceleration (in \( \text{m/s}^2 \)).

The unit of weight is thus derived as:

\[ W \, \text{(weight)} = \text{kg} \cdot \text{m/s}^2 = \text{N}. \]

So, weight is always expressed in Newtons because it is a force. The unit kilogram (kg), on the other hand, is used to measure mass, which is not the same as weight.

—

Can We Convert Newtons to Kilograms?

Yes, but with a specific assumption. Since weight is proportional to mass via the gravitational acceleration (\( g \)), you can convert between the two if you know the value of \( g \) at the location of the object.

The relation is:

\[ m = \frac{W}{g}. \]

For example:

  1. At the surface of the Earth, \( g \approx 9.8 \, \text{m/s}^2 \). If an object’s weight is \( W = 4.9033 \, \text{N} \):
    \[ m = \frac{4.9033}{9.8} \approx 0.5 \, \text{kg}. \]
  2. At an altitude of 2638 km, the gravitational acceleration (\( g \)) is weaker because it decreases with altitude. Assuming \( g \approx 4.9 \, \text{m/s}^2 \) at this height:
    \[ m = \frac{4.9033}{4.9} \approx 1.0 \, \text{kg}. \]

The “mass in kilograms” will remain constant regardless of location, but the weight in Newtons will change with \( g \).

—

Key Takeaway:

  • Weight is correctly expressed in Newtons.
  • Mass is expressed in kilograms.
  • You can convert weight (N) to mass (kg) using the local value of gravitational acceleration \( g \).

[end chatgpt]

Mass is equivocal

  1. Concept of mass is heavily abused in physics.
  2. Mass is a rotten word because it is abused with equivocation.

Mass is casuistic

  1. In physics mass is defined on the fly case by case by the physicists. This is called doing physics by authority

What is massless particle?

  1. Both mass and particle are equivocal and casuistic
  2. The concept of massless particle is a masterpiece of rhetorical sophistry
  3. We have other similar concepts in physics like “point mass”.
  4. If in physics we see an equivocal word we know that physicists are trying to hide an important concept contradicting their official dogma
  5. It is our duty to expose what physicists are trying to hide or whose authority they are trying to save by massless mass because massless particle means massless mass.
  6. From this we also see that in physics contradiction is legal.
  7. In any academic or knowledge system where contradiction, equivocation and casuistry are legal that field is called scholasticism.

Is weight a property of matter?

  1. I don’t think so
  2. “tendency of the parts to join together”, I guess from Kepler?

Newton’s concept of mass

  1. Newton’s concept of mass is related to the constant term in Kepler’s Rule
  2. We can compute this value of this constant. If I remember correctly, this matches Newtonian mass except with 4 pi squared
  3. Mass is density so Kepler’s Rule must be used.
  4. We also need to expose official Newtonian algorithms to appropriate Kepler’s Rule
  5. Kepler’s Rule is empirical and it is fundamental

Created: 2025-03-26 Wed 16:08

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