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

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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.

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Physics: explore STEM content (page 15 of 27) · openstem

Flowchart9 objects

Physics

Physics · L3 · Fluid Dynamics: Continuity & Bernoulli's Principle · flowchart

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Physics · L3 · Fluid Dynamics: Continuity & Bernoulli's Principle · flowchart

Quiz3 questions

The time-dependent Schrödinger equation in Dirac notation is:

Aiℏ ∂|ψ⟩/∂t = p̂²|ψ⟩/2mB−iℏ ∂|ψ⟩/∂t = Ĥ|ψ⟩Ciℏ ∂|ψ⟩/∂t = Ĥ|ψ⟩Dℏ ∂|ψ⟩/∂t = Ĥ|ψ⟩

Physics

Physics · L5 · Formal Quantum Mechanics

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Physics · L5 · Formal Quantum Mechanics

Collection4 items

01Physics · L3 · Magnetic Force on Current-Carrying Wires

02Physics · L3 · Magnetic Force on Current-Carrying Wires

03Physics · L3 · Finding the Force on a Current-Carrying Wire

+1 more

Physics

Physics · L3 · Magnetic Force on Current-Carrying Wires

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Physics · L3 · Magnetic Force on Current-Carrying Wires

Flowchart11 objects

Physics

Physics · L3 · Elastic or Inelastic?

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Physics · L3 · Elastic or Inelastic?

Note~373 words · 2 min

Two postulates, and everything else follows The second one is the troublemaker. Hold onto it and time and length have to give way instead. The Lorentz factor runs the whole show At everyday speeds γ sits so close to 1 that nothing looks unu

Physics

Physics · L4 · Special relativity: time dilation, length contraction, and E=mc²

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Physics · L4 · Special relativity: time dilation, length contraction, and E=mc²

Flowchart9 objects

Physics

Physics · L5 · Gauge Theories and the Higgs Mechanism · flowchart

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Physics · L5 · Gauge Theories and the Higgs Mechanism · flowchart

Quiz8 questions

In quantum field theory, what is treated as the fundamental physical object?

AThe particle, as a point object with a definite trajectoryBThe field, defined at every point of spacetime, with particles as its quantized excitationsCThe wavefunction on a fixed configuration spaceDThe spacetime metric alone

Physics

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

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

Flashcards8 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

Physics · L1 · Floating & Density

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Physics · L1 · Floating & Density

Quiz8 questions

A force is applied directly toward a hinge (along the line connecting the force's application point to the hinge). What torque does it produce about the hinge?

AMaximum torqueBZero torqueCTorque equal to the force magnitudeDTorque depends on the object's mass

Physics

Physics · L4 · Rotational Dynamics, Torque & Angular Momentum

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Physics · L4 · Rotational Dynamics, Torque & Angular Momentum

Collection4 items

01Physics · L3 · Newton's Third Law

02Physics · L3 · Newton's Third Law

03Physics · L3 · Identifying an Action-Reaction Pair

+1 more

Physics

Physics · L3 · Newton's Third Law

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Physics · L3 · Newton's Third Law

Note~381 words · 2 min

Two properties, not one Cooper pairing Cooper's insight: in a Fermi sea, an arbitrarily weak net attraction between two electrons near the Fermi surface binds them. Not a strong attraction. Any attraction at all. Individually the electrons

Physics

Physics · L5 · Superconductivity: BCS Theory and the Meissner Effect

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Physics · L5 · Superconductivity: BCS Theory and the Meissner Effect

Quiz6 questions

An object travels in a circle at constant speed. Which direction does its acceleration point?

AOutward, away from the centerBToward the center of the circleCIn the direction of travelDIt has no acceleration since its speed is constant

Physics

Physics · L3 · Circular Motion & Centripetal Force

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Physics · L3 · Circular Motion & Centripetal Force

Note~270 words · 1 min

Potential is energy per charge A charge in an electric field has potential energy, just like a mass has gravitational potential energy. Divide out the charge and you get potential, better known as voltage. Capacitors Two conductive plates w

Physics

Physics · L3 · Electric Potential & Capacitors

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Physics · L3 · Electric Potential & Capacitors

Quiz4 questions

What does a battery do in a circuit?

AIt blocks electricity from flowingBIt pushes electricity around the loopCIt only works when the bulb is brokenDIt makes the wires longer

Physics

Physics · L1 · Batteries & Circuits

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Physics · L1 · Batteries & Circuits

Collection4 items

01Physics · L1 · Mirrors & Reflections

02Physics · L1 · Mirrors & Reflections

03Physics · L1 · Light Bounces Off a Mirror

+1 more

Physics

Physics · L1 · Mirrors & Reflections

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Physics · L1 · Mirrors & Reflections

Quiz4 questions

What does a thermometer measure?

AHow heavy something isBHow hot or cold something isCHow loud something isDHow big something is

Physics

Physics · L1 · Heat & Temperature

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Physics · L1 · Heat & Temperature

Flowchart13 objects

Physics

Physics · L5 · Standard Model Particle Classification

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Physics · L5 · Standard Model Particle Classification

Flowchart7 objects

Physics

Physics · L2 · Wave Basics · flowchart

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Physics · L2 · Wave Basics · flowchart

Flowchart15 objects

Physics

Physics · L5 · From the Friedmann Equation to the Universe's Expansion History

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Physics · L5 · From the Friedmann Equation to the Universe's Expansion History

Flashcards8 cards

What is momentum, in everyday words?1 / 8

Momentum is how hard something is to stop once it's moving. A moving object with a lot of momentum is hard to bring to a halt.

Physics

Physics · L2 · Momentum & Collisions

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Physics · L2 · Momentum & Collisions

Quiz6 questions

What does torque measure?

AHow fast an object moves in a straight lineBHow much a force rotates an object around a pivot pointCThe total energy stored in a spinning objectDThe friction between two surfaces

Physics

Physics · L3 · Torque & Rotational Equilibrium

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Physics · L3 · Torque & Rotational Equilibrium

Note~238 words · 1 min

What makes a machine "simple" Not a robot and not a motor. A simple machine is just a helpful shape: a slope, a bar, a wheel. It has no engine, so you still do the pushing. It just makes the job feel easier. Six of them, all around the hous

Physics

Physics · L1 · Simple Machines

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Physics · L1 · Simple Machines

Collection4 items

01Physics · L4 · Electromagnetic Induction

02Physics · L4 · Electromagnetic Induction

03Physics · L4 · Applying Lenz's Law

+1 more

Physics

Physics · L4 · Electromagnetic Induction

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Physics · L4 · Electromagnetic Induction

Quiz8 questions

Which Maxwell equation directly implies that magnetic monopoles do not exist?

AGauss's law for electricityBGauss's law for magnetismCFaraday's lawDThe Ampère-Maxwell law

Physics

Physics · L4 · Maxwell's Equations & EM Waves

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Physics · L4 · Maxwell's Equations & EM Waves

Flowchart5 objects

Physics

Physics · L4 · Polarization & Diffraction · flowchart

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Physics · L4 · Polarization & Diffraction · flowchart

Quiz10 questions

The speed of sound doubles. If the frequency stays the same, what happens to the wavelength?

AIt halvesBIt stays the sameCIt doublesDIt quadruples

Physics

Physics · L4 · Waves & Optics — 10 Q

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Physics · L4 · Waves & Optics — 10 Q

Flashcards10 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

Physics · L1 · Springs & Stretchy Things

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Physics · L1 · Springs & Stretchy Things

Note~245 words · 1 min

Usually more than one push at a time Most things have several pushes or pulls acting on them at once. What happens next depends on whether those forces match each other. Tug of war A book sitting still Friction is the hidden one Roll a ball

Physics

Physics · L1 · Balanced & Unbalanced Forces

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Physics · L1 · Balanced & Unbalanced Forces

Flashcards10 cards

What condition on the restoring force defines simple harmonic motion (SHM)?1 / 10

The restoring force must be proportional to the displacement from equilibrium, and always point back toward it. A spring obeying Hooke's law does this exactly; a pendulum does it approximately, for small swing angles.

Physics

Physics · L3 · Simple Harmonic Motion: Springs & Pendulums

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Physics · L3 · Simple Harmonic Motion: Springs & Pendulums

Note~361 words · 2 min

Four laws, in one breath First law: bookkeeping The four standard processes Second law: entropy, and why heat has a direction Entropy counted properly Boltzmann's formula says entropy is really a count of how many microscopic arrangements p

Physics

Physics · L4 · Thermodynamics: the four laws

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Physics · L4 · Thermodynamics: the four laws

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