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OpenStem
@openstem · Joined Jul 2026
7420 public items8 groups
Collection5 items
01Physics · L5 · Covariant Electrodynamics
02Physics · L5 · Covariant Electrodynamics — Four-Potential, Gauge, and Field Mixing
03Physics · L5 · Covariant Electrodynamics: The Electromagnetic Field Tensor
+2 morePhysics · L5 · Covariant Electrodynamics
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Physics · L5 · Covariant ElectrodynamicsCollection6 items
01Physics · L5 · Phase Transitions & Critical Phenomena
02Physics · L5 · Phase Transitions & Critical Phenomena
03Physics · L5 · Phase Transitions and Critical Phenomena
+3 morePhysics · L5 · Phase Transitions & Critical Phenomena
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Physics · L5 · Phase Transitions & Critical PhenomenaCollection5 items
01Physics · L5 · Quantum Field Theory
02Physics · L5 · Quantum Field Theory
03Physics · L5 · Quantum Field Theory: Fields, Propagators, and Feynman Diagrams
+2 morePhysics · L5 · Quantum Field Theory
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Physics · L5 · Quantum Field TheoryCollection4 items
01Physics · L5 · Perturbation Theory & Scattering
02Physics · L5 · Perturbation Theory and Scattering
03Physics · L5 · Choosing a Scattering Approximation
+1 morePhysics · L5 · Perturbation Theory & Scattering
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Physics · L5 · Perturbation Theory & ScatteringCollection4 items
01Physics · L5 · Cosmology — Friedmann Equations & the Expanding Universe
02Physics · L5 · Cosmology: the Friedmann Equations and the Expanding Universe
03Physics · L5 · From the Friedmann Equation to the Universe's Expansion History
+1 morePhysics · L5 · Cosmology — Friedmann Equations & the Expanding Universe
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Physics · L5 · Cosmology — Friedmann Equations & the Expanding UniverseCollection4 items
01Physics · L5 · Superconductivity — BCS Theory & the Meissner Effect
02Physics · L5 · Superconductivity: BCS Theory and the Meissner Effect
03Physics · L5 · Superconducting Response to an External Magnetic Field
+1 morePhysics · L5 · Superconductivity — BCS Theory & the Meissner Effect
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Physics · L5 · Superconductivity — BCS Theory & the Meissner EffectCollection4 items
01Physics · L5 · Quantum Information — Entanglement & Bell's Theorem
02Physics · L5 · Quantum Information: Entanglement and Bell's Theorem
03Physics · L5 · Testing Bell's Inequality
+1 morePhysics · L5 · Quantum Information — Entanglement & Bell's Theorem
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Physics · L5 · Quantum Information — Entanglement & Bell's TheoremCollection4 items
01Physics · L5 · Gauge Theories & the Higgs Mechanism
02Physics · L5 · Gauge Theories and the Higgs Mechanism
03Physics · L5 · The Higgs Mechanism: From Symmetric Vacuum to Massive Gauge Bosons
+1 morePhysics · L5 · Gauge Theories & the Higgs Mechanism
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Physics · L5 · Gauge Theories & the Higgs MechanismCollection4 items
01Physics · L5 · Plasma Physics — Debye Shielding & Plasma Oscillations
02Physics · L5 · Plasma Physics: Debye Shielding and Collective Behaviour
03Physics · L5 · Wave Propagation vs Reflection in a Plasma
+1 morePhysics · L5 · Plasma Physics — Debye Shielding & Plasma Oscillations
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Physics · L5 · Plasma Physics — Debye Shielding & Plasma OscillationsCollection4 items
01Physics · L5 · The Path Integral Formulation of Quantum Mechanics
02Physics · L5 · The Path Integral Formulation of Quantum Mechanics
03Physics · L5 · From Path Integral to Classical Mechanics and to Statistical Mechanics
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Physics · L5 · The Path Integral Formulation of Quantum MechanicsCollection4 items
01Physics · L5 · Nuclear Astrophysics — Stellar Nucleosynthesis
02Physics · L5 · Nuclear Astrophysics: How Stars Build the Elements
03Physics · L5 · Stellar Nucleosynthesis Pathway by Stellar Mass and Element
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Physics · L5 · Nuclear Astrophysics — Stellar NucleosynthesisCollection3 items
01Physics · L5 · Quantum Optics — Coherent States & Cavity QED
02Physics · L5 · Quantum Optics: Coherent States and Cavity QED
03Physics · L5 · Quantum Optics
Physics · L5 · Quantum Optics — Coherent States & Cavity QED
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Physics · L5 · Quantum Optics — Coherent States & Cavity QEDFlashcards5 cards
What is a push?1 / 5
A push is a force that moves something away from you. You push a door to open it.
Physics · L1 · Push and Pull
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Physics · L1 · Push and PullFlashcards5 cards
What does a magnet do?1 / 5
A magnet pulls some metal objects toward it without touching them. This invisible pull is called magnetism.
Physics · L1 · Magnets
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Physics · L1 · MagnetsFlashcards9 cards
What tool tells you how hot or cold something is?1 / 9
A thermometer. It measures temperature — a number that tells you how hot or cold something is.
Physics · L1 · Heat & Temperature
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Physics · L1 · Heat & TemperatureFlashcards10 cards
What does a battery do?1 / 10
A battery stores energy and pushes it around a circuit to make things like bulbs work.
Physics · L1 · Batteries & Circuits
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Physics · L1 · Batteries & CircuitsFlashcards9 cards
What is gravity?1 / 9
Gravity is an invisible force that pulls things down toward the Earth. It is why things fall instead of floating away.
Physics · L1 · Gravity & Falling
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Physics · L1 · Gravity & FallingFlashcards9 cards
What happens when light hits a mirror?1 / 9
Light bounces off the mirror instead of passing through it. This bouncing is called reflection.
Physics · L1 · Mirrors & Reflections
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Physics · L1 · Mirrors & ReflectionsFlashcards8 cards
A tiny pebble sinks, but a huge metal ship floats. How can that be?1 / 8
It is not just about how heavy something is — its shape matters too. The ship is shaped like a big hollow bowl, so it pushes a lot of water out of the way. That helps it float, even though it is heavy.
Physics · L1 · Floating & Density
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Physics · L1 · Floating & DensityFlashcards9 cards
What makes a sound loud?1 / 9
Shaking or vibrating something hard makes a loud sound. A big, strong shake means a big, loud sound.
Physics · L1 · Sound & Music
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Physics · L1 · Sound & MusicFlashcards10 cards
Is a rock a solid, a liquid, or a gas?1 / 10
A solid. It keeps its own shape — a rock stays a rock, whether it sits on a table or in your hand.
Physics · L1 · Solids, Liquids & Gases
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Physics · L1 · Solids, Liquids & GasesFlashcards8 cards
When is your shadow the longest — morning or midday?1 / 8
In the morning! Shadows are long in the early morning and get shorter as the day goes on.
Physics · L1 · Shadows Through the Day
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Physics · L1 · Shadows Through the DayFlashcards10 cards
Where on a bar magnet is the pull strongest?1 / 10
At the two ends, called the poles. The middle of the magnet barely pulls at all.
Physics · L1 · Magnets: A Closer Look
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Physics · L1 · Magnets: A Closer LookFlashcards10 cards
What is a simple machine?1 / 10
A simple machine is a plain tool with no engine or motor that makes a job easier for you.
Physics · L1 · Simple Machines
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Physics · L1 · Simple MachinesFlashcards10 cards
In tug of war, both teams pull equally hard. Does the rope move?1 / 10
No, the rope stays still. The two pulls are equally strong but point in opposite directions, so they cancel out.
Physics · L1 · Balanced & Unbalanced Forces
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Physics · L1 · Balanced & Unbalanced ForcesFlashcards10 cards
A swing is pulled back and held still, high in the air. Is it moving or ready to move?1 / 10
It is ready to move. Even though it is still, it is holding stored-up energy that is waiting to be let go.
Physics · L1 · Energy in Motion
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Physics · L1 · Energy in MotionFlashcards10 cards
What does it mean to say something is 'fast'?1 / 10
It means the thing covers a lot of distance or gets somewhere in a short time.
Physics · L1 · Fast & Slow
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Physics · L1 · Fast & SlowFlashcards10 cards
What happens when you stretch a rubber band and then let go?1 / 10
It snaps right back to its original size and shape. That springing-back is called being elastic.
Physics · L1 · Springs & Stretchy Things
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Physics · L1 · Springs & Stretchy ThingsFlashcards10 cards
How can you tell which of two objects is heavier?1 / 10
You can hold one in each hand and feel which one pulls down harder, or put them on a scale that measures exactly how heavy each one is.
Physics · L1 · Weighing & Balancing
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Physics · L1 · Weighing & BalancingFlashcards10 cards
Is white light really just one plain color?1 / 10
No! White light, like sunlight, is secretly made of all the rainbow colors mixed together. It only looks plain white because they are all blended.
Physics · L1 · Rainbows & Mixing Colors
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Physics · L1 · Rainbows & Mixing Colors