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Physics: explore STEM content (page 6 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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Quiz6 questions

Which of these best defines the wavelength of a wave?

AThe time for one complete cycle to pass a pointBThe distance between two corresponding points on consecutive cycles, e.g. crest to crestCThe maximum displacement of a particle from its rest positionDThe number of cycles passing a point each second

Physics

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

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

Flowchart11 objects

Physics

Physics · L2 · Stretching a Spring: Within Limits or Past Them

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Physics · L2 · Stretching a Spring: Within Limits or Past Them

Note~319 words · 2 min

Every mass pulls on every other mass Gravity isn't an Earth thing. Any two objects with mass attract each other, from two apples on a table to two galaxies. Inverse square: it fades fast The plot below is that exact shape. It's the same 1/r

Physics

Physics · L3 · Universal Gravitation & Orbits

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Physics · L3 · Universal Gravitation & Orbits

Note~478 words · 2 min

Bloch's theorem A conduction electron in a crystal sees a potential that repeats: U(r + a) = U(r) for every lattice vector a. That periodicity forces a specific form on the eigenstates. Where the gap comes from Both give the same answer fro

Physics

Physics · L5 · Condensed Matter Physics: Band Theory & Semiconductors

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Physics · L5 · Condensed Matter Physics: Band Theory & Semiconductors

Quiz4 questions

What does a simple machine need to work?

ABatteriesBAn engine or motorCEffort from a personDAn electrical plug

Physics

Physics · L1 · Simple Machines

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Physics · L1 · Simple Machines

Collection4 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

+1 more

Physics

Physics · L5 · The Path Integral Formulation of Quantum Mechanics

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Physics · L5 · The Path Integral Formulation of Quantum Mechanics

Note~374 words · 2 min

Two independent questions Every sound starts with something vibrating: a string, a drum skin, your vocal cords, a speaker cone. That vibration pushes and pulls the air, sending squeezed and stretched regions outward to your ear. A hummingbi

Physics

Physics · L2 · Sound: Pitch, Loudness & Echoes

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Physics · L2 · Sound: Pitch, Loudness & Echoes

Quiz4 questions

A swing is pulled back and held still in the air. What kind of energy does it have?

ANo energy at allBKinetic (moving) energyCPotential (stored-up) energyDSound energy

Physics

Physics · L1 · Energy in Motion

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Physics · L1 · Energy in Motion

Flashcards7 cards

Why does a crash at high speed feel far more dangerous than a crash at low speed?1 / 7

A faster-moving car has much more momentum, so far more motion has to be stopped very suddenly — that's what causes serious injury.

Physics

Physics · L2 · Momentum & Collisions

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Physics · L2 · Momentum & Collisions

Flashcards8 cards

A 0.50 kg mass on a spring with k = 200 N/m starts at rest, displaced 0.10 m. Find ω and T.1 / 8

ω = √(k/m) = √(200/0.50) = √400 = 20 rad/s. T = 2π/ω = 2π/20 ≈ 0.314 s.

Physics

Physics · L4 · Oscillations & Resonance

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Physics · L4 · Oscillations & Resonance

Flowchart11 objects

Physics

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

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

Collection5 items

01Physics · L3 · Conservation of Momentum

02Physics · L3 · Conservation of Momentum

03Physics · L3 · Conservation of Momentum

+2 more

Physics

Physics · L3 · Conservation of Momentum

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Physics · L3 · Conservation of Momentum

Flowchart7 objects

Physics

Physics · L1 · Wind & Moving Air · flowchart

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Physics · L1 · Wind & Moving Air · flowchart

Quiz6 questions

A ball launches at 10 m/s at 90° above horizontal (straight up). Why can't the range formula R = v₀²sin(2θ)/g be applied meaningfully here in the usual sense?

AIt can — the formula gives R = 0, which matches the ball landing back where it launchedBThe formula only works for negative anglesCg would need to be zeroDThe ball never comes back down

Physics

Physics · L3 · Projectile Motion

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Physics · L3 · Projectile Motion

Quiz6 questions

A converging (convex) lens is thicker in the middle than at the edges. What happens to parallel light rays after passing through it?

AThey spread apart, appearing to come from a point on the same sideBThey converge, meeting at the focal point on the far side of the lensCThey reflect straight back the way they cameDThey pass straight through completely unchanged

Physics

Physics · L3 · Lenses & Optical Instruments

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Physics · L3 · Lenses & Optical Instruments

Flowchart7 objects

Physics

Physics · L3 · Newton's Third Law · flowchart

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Physics · L3 · Newton's Third Law · flowchart

Note~410 words · 2 min

The order parameter Pick a quantity that's zero in the disordered high-symmetry phase and non-zero once the symmetry breaks. That's your order parameter, and it organises the whole subject. Two kinds of transition Critical exponents Near a

Physics

Physics · L5 · Phase Transitions and Critical Phenomena

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Physics · L5 · Phase Transitions and Critical Phenomena

Collection5 items

01Physics · L2 · Series Circuits

02Physics · L2 · Parallel Circuits

03Physics · L2 · Series & Parallel Circuits

+2 more

Physics

Physics · L2 · Series & Parallel Circuits

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Physics · L2 · Series & Parallel Circuits

Note~423 words · 2 min

Why you need it Exactly solvable quantum systems are a short list: harmonic oscillator, hydrogen, particle in a box. Everything else is one of those plus a small extra term, and perturbation theory is how you cash that in. Time-independent,

Physics

Physics · L5 · Perturbation Theory and Scattering

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Physics · L5 · Perturbation Theory and Scattering

Flowchart11 objects

Physics

Physics · L1 · A Shadow's Journey Through the Day

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Physics · L1 · A Shadow's Journey Through the Day

Plot1 plot · 1 param

Physics

Projectile Trajectory: y = x·tan(a) − x²/40

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Projectile Trajectory: y = x·tan(a) − x²/40

Flashcards14 cards

Write the general solution for simple harmonic motion, x(t).1 / 14

x(t) = A·cos(ωt + φ), where A is the amplitude, ω is the angular frequency, and φ is the phase constant set by initial conditions.

Physics

Physics · L4 · Oscillations & Resonance

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Physics · L4 · Oscillations & Resonance

Quiz4 questions

When is a shadow usually at its shortest?

AEarly in the morningBAround middayCLate in the eveningDAt midnight

Physics

Physics · L1 · Shadows Through the Day

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Physics · L1 · Shadows Through the Day

Flashcards8 cards

What does this equation, Hooke's Law, describe?1 / 8

The force needed to stretch or compress a spring, where k is the spring constant and x is how far it's stretched or compressed from its natural length.

Physics

Physics · L2 · Springs & Hooke's Law

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Physics · L2 · Springs & Hooke's Law

Flowchart5 objects

Physics

Physics · L4 · Nuclear Physics — 7 Q · flowchart

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Physics · L4 · Nuclear Physics — 7 Q · flowchart

Quiz6 questions

What does Hooke's Law, F = kx, describe?

AThe relationship between a spring's mass and its lengthBThe force needed to stretch or compress a spring by a given amountCHow fast a spring vibrates over timeDThe temperature at which a spring melts

Physics

Physics · L2 · Springs & Hooke's Law

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Physics · L2 · Springs & Hooke's Law

Flowchart11 objects

Physics

Physics · L2 · Curved Mirrors · flowchart

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Physics · L2 · Curved Mirrors · flowchart

Collection4 items

01Physics · L2 · Wave Basics

02Physics · L2 · Wave Basics

03Physics · L2 · Sorting a Wave: Transverse or Longitudinal?

+1 more

Physics

Physics · L2 · Wave Basics

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Physics · L2 · Wave Basics

Flashcards8 cards

What does "work" mean in physics?1 / 8

Work is done when a force makes something move in the direction of the force. Pushing without any movement is not work in physics, even if it tires you out.

Physics

Physics · L2 · Work & Power

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Physics · L2 · Work & Power

Flowchart9 objects

Physics

Physics · L1 · Springs & Stretchy Things · flowchart

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Physics · L1 · Springs & Stretchy Things · flowchart

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