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Physics: explore STEM content (page 18 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.

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Flowchart13 objects

Physics

Physics · L4 · How Maxwell's Equations Generate a Self-Propagating EM Wave

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Physics · L4 · How Maxwell's Equations Generate a Self-Propagating EM Wave

Flashcards8 cards

State the First Law of Thermodynamics.1 / 8

Energy cannot be created or destroyed, only converted from one form to another or transferred as heat and work. The total energy of an isolated system stays constant.

Physics

Physics · L3 · The Laws of Thermodynamics & Heat Engines

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Physics · L3 · The Laws of Thermodynamics & Heat Engines

Flowchart13 objects

Physics

Physics · L4 · RC circuit: charging and discharging

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Physics · L4 · RC circuit: charging and discharging

Collection4 items

01Physics · L3 · Electromagnetic Induction: Faraday's & Lenz's Laws

02Physics · L3 · Electromagnetic Induction: Faraday's & Lenz's Laws

03Physics · L3 · How a Generator Produces Alternating Current

+1 more

Physics

Physics · L3 · Electromagnetic Induction: Faraday's & Lenz's Laws

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Physics · L3 · Electromagnetic Induction: Faraday's & Lenz's Laws

Note~196 words · 1 min

Rubbing moves tiny charges Everything is made of tiny particles carrying a little electric charge. Usually they're balanced, so nothing pulls or pushes. Rub two things together, like a balloon and your hair, and some of those charges rub of

Physics

Physics · L1 · Static Electricity: Balloons & Hair

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Physics · L1 · Static Electricity: Balloons & Hair

Flashcards10 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

Physics · L1 · Energy in Motion

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Physics · L1 · Energy in Motion

Note~262 words · 1 min

One curve, two independent problems The trick is refusing to treat it as a curved-path problem. It's two straight-line problems running at the same time, and they don't talk to each other. Split the launch velocity The three formulas Worked

Physics

Physics · L3 · Projectile Motion: Range, Height, and Time of Flight

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Physics · L3 · Projectile Motion: Range, Height, and Time of Flight

Flashcards9 cards

What is buoyant force?1 / 9

Buoyant force is the upward push a fluid (like water or air) gives to an object placed in it.

Physics

Physics · L2 · Buoyancy & Archimedes' Principle

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Physics · L2 · Buoyancy & Archimedes' Principle

Flowchart7 objects

Physics

Physics · L3 · Lenses & Optical Instruments · flowchart

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Physics · L3 · Lenses & Optical Instruments · flowchart

Flowchart6 objects

Physics

Physics · L2 · Permanent Magnets & Field Lines · flowchart

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Physics · L2 · Permanent Magnets & Field Lines · flowchart

Flashcards9 cards

What is the wavelength (λ) of a wave?1 / 9

The distance between two corresponding points on consecutive cycles of a wave — for example, crest to crest or trough to trough. Measured in metres.

Physics

Physics · L3 · Wave Properties

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Physics · L3 · Wave Properties

Flashcards5 cards

What mathematical structure does quantum mechanics assign to the state space of a physical system?1 / 5

A separable complex Hilbert space ℋ. Pure states are represented by unit rays (equivalence classes of vectors differing by a phase), or equivalently by rank-1 projection operators (density matrices |ψ⟩⟨ψ|).

Physics

Physics · L5 · Formal Quantum Mechanics

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Physics · L5 · Formal Quantum Mechanics

Flashcards8 cards

State the ideal gas law and identify each symbol.1 / 8

PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the universal gas constant (8.314 J/(mol·K)), and T is absolute temperature (in kelvin).

Physics

Physics · L4 · Kinetic Theory of Gases

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Physics · L4 · Kinetic Theory of Gases

Flowchart7 objects

Physics

Physics · L2 · Heat Transfer · flowchart

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Physics · L2 · Heat Transfer · flowchart

Quiz6 questions

In non-degenerate time-independent perturbation theory, the first-order energy correction E_n⁽¹⁾ equals:

AThe sum over all other states of the coupling matrix elementB⟨n⁽⁰⁾|H'|n⁽⁰⁾⟩, the expectation value of H' in the unperturbed stateCZero, alwaysDThe unperturbed energy E_n⁽⁰⁾ itself

Physics

Physics · L5 · Perturbation Theory & Scattering

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Physics · L5 · Perturbation Theory & Scattering

Flashcards8 cards

What is a transverse wave?1 / 8

A wave in which particles of the medium move perpendicular (at right angles) to the direction the wave travels — like a rope flicked up and down while the wave moves sideways.

Physics

Physics · L3 · Wave Properties

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Physics · L3 · Wave Properties

Flashcards8 cards

What generally happens to the size of most materials when they're heated?1 / 8

They expand — their particles vibrate more and spread slightly farther apart, so the material takes up more space.

Physics

Physics · L2 · Thermal Expansion

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Physics · L2 · Thermal Expansion

Note~342 words · 2 min

Separate the load from the shape A thick steel cable stretches less than a thin one under the same pull. That's geometry, not material. Stress and strain divide the geometry out so you can compare materials directly. Hooke's law for materia

Physics

Physics · L4 · Elasticity: stress, strain, and Young's modulus

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Physics · L4 · Elasticity: stress, strain, and Young's modulus

Flowchart10 objects

Physics

Physics · L2 · Is Work Being Done?

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Physics · L2 · Is Work Being Done?

Quiz6 questions

What is wind?

AAir that is movingBA kind of lightCWater vapor onlyDA force that only exists near the ocean

Physics

Physics · L1 · Wind & Moving Air

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Physics · L1 · Wind & Moving Air

Flowchart9 objects

Physics

Physics · L3 · Lenses & Optical Instruments · flowchart

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Physics · L3 · Lenses & Optical Instruments · flowchart

Note~202 words · 1 min

Your shadow changes all day Check your shadow in the morning, at lunchtime, and before dinner. It won't look the same. Sometimes it stretches out long, sometimes it shrinks right down. That's because the Sun doesn't stay put. It appears low

Physics

Physics · L1 · Shadows Through the Day

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Physics · L1 · Shadows Through the Day

Quiz7 questions

A long straight wire carries 4 A. What is the magnetic field magnitude 2 cm away? (μ₀ = 4π × 10⁻⁷ T·m/A)

A2 × 10⁻⁵ TB4 × 10⁻⁵ TC8 × 10⁻⁵ TD1.6 × 10⁻⁴ T

Physics

Physics · L4 · Magnetism — 7 Q

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Physics · L4 · Magnetism — 7 Q

Flowchart10 objects

Physics

Physics · L4 · Entropy, heat engines, and the Carnot cycle · flowchart

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Physics · L4 · Entropy, heat engines, and the Carnot cycle · flowchart

Note~261 words · 1 min

A wave carries energy, not matter Drop a pebble in a pond. Ripples race outward, but a floating leaf just bobs and stays put. Transverse: the medium moves across the travel direction A stadium wave is the same shape: people stand and sit in

Physics

Physics · L2 · Wave Basics

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Physics · L2 · Wave Basics

Quiz4 questions

What is gravity?

AA force that pulls things down toward the EarthBA kind of windCA force that pushes things upDSomething only astronauts feel

Physics

Physics · L1 · Gravity & Falling

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Physics · L1 · Gravity & Falling

Flowchart7 objects

Physics

Physics · L1 · Solids, Liquids & Gases · flowchart

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Physics · L1 · Solids, Liquids & Gases · flowchart

Flashcards8 cards

What determines the speed of sound in a medium, in general terms?1 / 8

v = √(elastic property / density) — for a gas, roughly v = √(γRT/M) for an ideal gas (γ ratio of specific heats). Sound travels faster in stiffer, less dense media: faster in solids than liquids, faster in liquids than gases.

Physics

Physics · L4 · Sound Waves & the Doppler Effect

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Physics · L4 · Sound Waves & the Doppler Effect

Note~221 words · 1 min

The invisible pull Gravity is a force you can't see but feel constantly. Earth pulls everything near it downward: you, your toys, raindrops, even the air. Let go of something with nothing holding it up and it falls. Not sideways, not upward

Physics

Physics · L1 · Gravity & Falling

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Physics · L1 · Gravity & Falling

Flashcards10 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

Physics · L1 · Batteries & Circuits

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Physics · L1 · Batteries & Circuits

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