Knowledge/Domain
Light, force, heat, and motion.
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A coordinate system in which an undisturbed body moves at constant velocity, and none is privileged.
Matter & Energy·13 connections
The energy a rolling tire loses to deformation, and why more pressure stops helping.
Matter & Energy·12 connections
Refractive index varies with wavelength, so a medium bends colors by different amounts.
Matter & Energy·10 connections
Pressure applied to a confined fluid is transmitted undiminished throughout it.
Light whose electric field oscillates in a preferred orientation, and the filters that select for it.
A closed loop that moves heat by boiling and condensing a working fluid at two pressures.
The rate at which tissue absorbs radiofrequency energy, measured in watts per kilogram.
Matter & Energy·9 connections
An object immersed in a fluid feels an upward force equal to the weight of the fluid it displaces, regardless of the object's own weight.
Matter & Energy·5 connections
The constant speed a falling object reaches once drag force grows large enough to exactly cancel gravity.
The single point at which an object's entire mass can be treated as concentrated for the purposes of translational motion.
Matter & Energy·4 connections
Waves bend around obstacles and spread through openings, an effect most pronounced when the gap or obstacle is close to the wavelength's own size.
Resistance to relative sliding between contacting surfaces, and a force that behaves very differently once motion actually starts.
The rotational counterpart to force — how strongly a force twists an object about a pivot rather than pushing it in a line.
A fluid's internal resistance to shear flow — how much it resists layers of itself sliding past each other.
A wave's observed frequency shifts because the source and the observer are moving relative to each other, not because the wave itself changes.
Matter & Energy·3 connections
A liquid's surface behaves like a stretched elastic membrane because surface molecules lack neighbors pulling outward.
Materials change size with temperature because hotter atoms vibrate through a wider average spacing, not just faster.