Notes on Mechanical Devices for the Electronics Experimenter: Difference between revisions
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=== Fundamental Qualities === | === Fundamental Qualities === | ||
We need to define some fundamentals before getting to the interesting stuff. Let's power through it. | We need to define some fundamentals before getting to the interesting stuff. Let's power through it. | ||
There's 3 fundamental qualities that makes up reality, physics-wise: | There's 3 fundamental qualities that makes up reality, physics-wise: | ||
1. Length - was once defined by a metal rod. Now it's defined by the speed of light. | 1. Length - was once defined by a metal rod. Now it's defined by the speed of light. | ||
2. Time - Once defined by a fraction of a day in 1900. Now it's defined by periods of radiation from a cesium atom. | 2. Time - Once defined by a fraction of a day in 1900. Now it's defined by periods of radiation from a cesium atom. | ||
3. Mass/Weight - Mass is constant, but weight is "mass * the-acceleration-of-gravity". In any case, for us it's the same. | 3. Mass/Weight - Mass is constant, but weight is "mass * the-acceleration-of-gravity". In any case, for us it's the same. | ||
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* Luminous Intensity - light-ness, measured in "candela" | * Luminous Intensity - light-ness, measured in "candela" | ||
* Temperature - measured in "kelvin" as well as F and C. | * Temperature - measured in "kelvin" as well as F and C. | ||
=== Vectors & Motion === | |||
How do measure how stuff moves across space (length) and time? | |||
==== Vectors ==== | |||
Vectors show you force has a horizontal and vertical component. For example, if this slash "\" had an arrow pointing down, then if it were moving a box, that would push it both into the floor and across the floor. Woo hoo. | |||
==== Motion ==== | |||
Here's some key things: | |||
1. Speed / Velocity - distance over time | |||
2. Rotational Speed - revolutions per minute or angular distance traveled (degrees per second, radians per minute) | |||
3. Acceleration - the rate of change of velocity. So if acceleration is 0, then the velocity is constant. (d*sec^-2) |
Revision as of 23:06, 3 August 2018
Summary
I got this book because I don't know much about mechanical engineering and this seemed like a great intro.
The introduction says it's meant for amateur experimenters to get a good foundation for experimentation and measurement and build by designing<=>building<=>testing.
Perfect!
Ch 1: Basic mechanical principles
Fundamental Qualities
We need to define some fundamentals before getting to the interesting stuff. Let's power through it.
There's 3 fundamental qualities that makes up reality, physics-wise:
1. Length - was once defined by a metal rod. Now it's defined by the speed of light.
2. Time - Once defined by a fraction of a day in 1900. Now it's defined by periods of radiation from a cesium atom.
3. Mass/Weight - Mass is constant, but weight is "mass * the-acceleration-of-gravity". In any case, for us it's the same.
Notably, here's a few units of mass:
- kilogram - kg -- 2.204 pound-mass
- pound-mass - lbm -- 0.4536 kg
- slug - slug -- 32.174 pound-mass
Yes, we're just treating pounds as a mass by calling it pound-mass.
There's also these other relevant units of reality:
- Electric Current - force generated between two conductors at some length, measured in "ampere"
- Luminous Intensity - light-ness, measured in "candela"
- Temperature - measured in "kelvin" as well as F and C.
Vectors & Motion
How do measure how stuff moves across space (length) and time?
Vectors
Vectors show you force has a horizontal and vertical component. For example, if this slash "\" had an arrow pointing down, then if it were moving a box, that would push it both into the floor and across the floor. Woo hoo.
Motion
Here's some key things:
1. Speed / Velocity - distance over time
2. Rotational Speed - revolutions per minute or angular distance traveled (degrees per second, radians per minute)
3. Acceleration - the rate of change of velocity. So if acceleration is 0, then the velocity is constant. (d*sec^-2)