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Physics: explore STEM content (page 25 of 27) · openstem

All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Physics Physics groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Physics

Mechanics, electromagnetism and quantum on openstem — flashcards, notes, quizzes, plots and sketches shared by the community. Study free, or clone anything into your library.

Content Groups1

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Flowchart14 objects

Physics

Physics · L1 · A Swing Turns Stored Energy Into Motion

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Physics · L1 · A Swing Turns Stored Energy Into Motion

Quiz10 questions

Two charges of +2 μC and +3 μC are 0.1 m apart. Is the force attractive or repulsive?

AAttractiveBRepulsiveCZeroDDepends on orientation

Physics

Physics · L4 · Electromagnetism — 10 Q

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Physics · L4 · Electromagnetism — 10 Q

Flowchart5 objects

Physics

Physics · L5 · Quantum Field Theory: Fields, Propagators & Feynman Diagrams · flowchart

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Physics · L5 · Quantum Field Theory: Fields, Propagators & Feynman Diagrams · flowchart

Flowchart7 objects

Physics

Physics · L2 · Pendulums & Periodic Motion · flowchart

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Physics · L2 · Pendulums & Periodic Motion · flowchart

Collection4 items

01Physics · L1 · Magnets: A Closer Look

02Physics · L1 · Magnets: A Closer Look

03Physics · L1 · Sorting Objects: Magnetic or Not?

+1 more

Physics

Physics · L1 · Magnets

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Physics · L1 · Magnets

Note~214 words · 1 min

Two reasons light reaches your eyes When you see something, light travelled from it into your eyes. But there are two very different reasons that light was coming from it. The left column are light sources. Everything in the right column yo

Physics

Physics · L1 · Where Light Comes From

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Physics · L1 · Where Light Comes From

Flowchart7 objects

Physics

Physics · L2 · Work & Power · flowchart

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Physics · L2 · Work & Power · flowchart

Flashcards9 cards

What is torque?1 / 9

A measure of how much a force makes an object rotate around a pivot point. It's the rotational equivalent of an ordinary push or pull — instead of causing straight-line acceleration, it causes angular acceleration.

Physics

Physics · L3 · Torque & Rotational Equilibrium

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Physics · L3 · Torque & Rotational Equilibrium

Flowchart5 objects

Physics

Physics · L4 · Entropy & Heat Engines — 8 Q · flowchart

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Physics · L4 · Entropy & Heat Engines — 8 Q · flowchart

Flashcards6 cards

What is speed?1 / 6

Speed is how far something moves in a certain time. Speed = distance ÷ time.

Physics

Physics · L2 · Speed: Distance and Time

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Physics · L2 · Speed: Distance and Time

Flashcards10 cards

What is friction?1 / 10

Friction is a force that resists motion between two surfaces touching each other. It always acts opposite to the direction something is sliding, or trying to slide.

Physics

Physics · L2 · Friction

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Physics · L2 · Friction

Flashcards7 cards

Why are soap bubbles always round?1 / 7

The thin soap film pulls itself into the smallest possible shape it can hold, and a sphere (a round ball shape) is the smallest shape that can hold air inside.

Physics

Physics · L1 · Bubbles & Surface Tension

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Physics · L1 · Bubbles & Surface Tension

Note~450 words · 2 min

Fields first, particles second Ordinary quantum mechanics fixes the particle number and gives you a wavefunction on configuration space. QFT inverts that. The fundamental objects are field operators φ̂(x) at every spacetime point, and parti

Physics

Physics · L5 · Quantum Field Theory: Fields, Propagators, and Feynman Diagrams

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Physics · L5 · Quantum Field Theory: Fields, Propagators, and Feynman Diagrams

Flowchart5 objects

Physics

Physics · L4 · AC Circuits — 7 Q · flowchart

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Physics · L4 · AC Circuits — 7 Q · flowchart

Note~379 words · 2 min

Why bother with a tensor In vector form, Maxwell is four equations about two fields, and you have to check Lorentz covariance one equation at a time. Special relativity is telling you there's a better object: one rank-2 tensor holding both

Physics

Physics · L5 · Covariant Electrodynamics: The Electromagnetic Field Tensor

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Physics · L5 · Covariant Electrodynamics: The Electromagnetic Field Tensor

Quiz10 questions

What does the first law of thermodynamics state?

AEntropy of an isolated system always increasesBEnergy of the universe is constant; ΔU = Q − WCHeat flows from cold to hot spontaneouslyDAbsolute zero is unattainable

Physics

Physics · L4 · Thermodynamics — 10 Q

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Physics · L4 · Thermodynamics — 10 Q

Note~377 words · 2 min

Sum over histories Canonical quantisation gives you operators. Schrödinger gives you a wave. Feynman gives you a third route: add up every path the particle could take, each weighted by a pure phase built from its classical action. Where th

Physics

Physics · L5 · The Path Integral Formulation of Quantum Mechanics

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Physics · L5 · The Path Integral Formulation of Quantum Mechanics

Flowchart9 objects

Physics

Physics · L2 · Magnetism & Electromagnets · flowchart

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Physics · L2 · Magnetism & Electromagnets · flowchart

Quiz5 questions

What makes a bar magnet a 'permanent' magnet?

AIt needs a battery to stay magneticBIt is magnetic all on its own, without any electricityCIt only works when a switch is turned onDIt loses its magnetism after a few minutes

Physics

Physics · L2 · Permanent Magnets & Field Lines

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Physics · L2 · Permanent Magnets & Field Lines

Flashcards8 cards

State the mirror equation and how it relates to the thin lens equation.1 / 8

1/f = 1/d_o + 1/d_i — the exact same form as the thin lens equation. For a spherical mirror, f = R/2, where R is the mirror's radius of curvature.

Physics

Physics · L4 · Geometric Optics — Mirrors & Image Formation

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Physics · L4 · Geometric Optics — Mirrors & Image Formation

Flowchart9 objects

Physics

Physics · L2 · Momentum & Collisions · flowchart

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Physics · L2 · Momentum & Collisions · flowchart

Note~264 words · 1 min

Four numbers describe any repeating wave A 10 Hz wave cycles ten times a second, so its period is 0.1 s. Frequency and period are the same fact stated two ways. The wave speed equation It holds for any periodic wave: sound, light, water, a

Physics

Physics · L3 · Wave Properties: Wavelength, Frequency, and Speed

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Physics · L3 · Wave Properties: Wavelength, Frequency, and Speed

Flashcards12 cards

How does an AC voltage source differ from a DC source?1 / 12

A DC source holds a constant polarity and magnitude. An AC source oscillates sinusoidally: v(t) = V₀ sin(ωt), where V₀ is the peak voltage and ω = 2πf is the angular frequency. Polarity and current direction reverse every half-cycle.

Physics

Physics · L4 · AC Circuits

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Physics · L4 · AC Circuits

Quiz6 questions

Which of these is NOT one of the two defining experimental signatures of superconductivity?

AZero DC electrical resistance below T_cBThe Meissner effect (active flux expulsion)CInfinite thermal conductivityDBoth zero resistance and the Meissner effect together

Physics