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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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Note~270 words · 1 min

Light can bounce Light travels in straight lines, but it can also bounce off things, like a ball off a wall. That bouncing is reflection. Some surfaces bounce light far better than others, which is why you see yourself clearly in a mirror a

Physics

Physics · L1 · Mirrors & Reflections

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Physics · L1 · Mirrors & Reflections

Flashcards10 cards

What is the entropy change of a system undergoing a reversible process?1 / 10

ΔS = Q_rev/T for an isothermal reversible process, or ΔS = ∫dQ_rev/T in general. Entropy is a state function, so ΔS depends only on the initial and final states, not on the path — even for an irreversible process, you can compute ΔS by inventing a reversible path between the same endpoints.

Physics

Physics · L4 · Entropy & Heat Engines

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Physics · L4 · Entropy & Heat Engines

Flashcards9 cards

What does Newton's First Law say?1 / 9

An object at rest stays at rest, and an object in motion keeps moving at the same speed and direction, unless a force acts on it.

Physics

Physics · L2 · Newton's Three Laws

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Physics · L2 · Newton's Three Laws

Quiz6 questions

Which idea best describes pressure?

AHow heavy an object isBForce spread over an areaCHow fast an object movesDThe total energy an object has

Physics

Physics · L2 · Pressure: Atmospheric & Fluid

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Physics · L2 · Pressure: Atmospheric & Fluid

Flashcards8 cards

State Fourier's law of heat conduction through a slab of thickness L, area A, and thermal conductivity k.1 / 8

The rate of heat flow: Q/t = kA(ΔT)/L, where ΔT is the temperature difference across the slab. Heat flows from hot to cold, at a rate proportional to the conductivity, area, and temperature gradient, and inversely proportional to thickness.

Physics

Physics · L4 · Heat Transfer — Conduction, Convection & Radiation

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Physics · L4 · Heat Transfer — Conduction, Convection & Radiation

Quiz8 questions

Which of the following is NOT a fundamental fermion in the Standard Model?

AElectronBUp quarkCPhotonDMuon neutrino

Physics

Physics · L5 · Particle Physics

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Physics · L5 · Particle Physics

Flowchart13 objects

Physics

Physics · L2 · Electrical Power & Energy · flowchart

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Physics · L2 · Electrical Power & Energy · flowchart

Collection4 items

01Physics · L3 · Projectile Motion

02Physics · L3 · Projectile Motion: Range, Height, and Time of Flight

03Physics · L3 · Solving a Projectile Motion Problem

+1 more

Physics

Physics · L3 · Projectile Motion

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Physics · L3 · Projectile Motion

Flashcards9 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

Physics · L1 · Mirrors & Reflections

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Physics · L1 · Mirrors & Reflections

Flashcards10 cards

What is the specific heat formula, and what does each symbol mean?1 / 10

q is heat energy in joules, m is mass in kg, c is the substance's specific heat capacity in J/(kg·°C), and ΔT is the temperature change in °C.

Physics

Physics · L3 · Specific Heat & Calorimetry

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Physics · L3 · Specific Heat & Calorimetry

Flashcards5 cards

Define the canonical partition function Z for a system in thermal contact with a reservoir at temperature T.1 / 5

Z is a sum over all microstates i with energy Eᵢ:

Physics

Physics · L5 · Statistical Mechanics

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Physics · L5 · Statistical Mechanics

Quiz6 questions

In the SUVAT equations, what does the letter "u" represent?

AFinal velocityBInitial velocityCDisplacementDTime

Physics

Physics · L3 · 1D Kinematics: The SUVAT Equations

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Physics · L3 · 1D Kinematics: The SUVAT Equations

Collection5 items

01Physics · L2 · Work & Power

02Physics · L2 · Work & Power: Practice Problems

03Physics · L2 · Work & Power

+2 more

Physics

Physics · L2 · Work & Power

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Physics · L2 · Work & Power

Flowchart11 objects

Physics

Physics · L5 · Wave Propagation vs Reflection in a Plasma

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Physics · L5 · Wave Propagation vs Reflection in a Plasma

Flashcards8 cards

State the Biot–Savart law for the field of a current element.1 / 8

dB = (μ₀/4π) · I dL × r̂ / r², where I dL is a current element, r̂ points from the element to the field point, and r is the distance between them. The total field is the vector sum (integral) of contributions from every element along the wire.

Physics

Physics · L4 · Magnetism — Biot–Savart & Ampere's Law

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Physics · L4 · Magnetism — Biot–Savart & Ampere's Law

Collection4 items

01Physics · L2 · Refraction & Lenses

02Physics · L2 · Refraction & Lenses

03Physics · L2 · Light Bending From Air Into Water

+1 more

Physics

Physics · L2 · Refraction & Lenses

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Physics · L2 · Refraction & Lenses

Flowchart9 objects

Physics

Physics · L3 · Circular Motion & Centripetal Force · flowchart

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Physics · L3 · Circular Motion & Centripetal Force · flowchart

Plot1 plot · 2 params

Physics

Wave Superposition: sin(x) + a·sin(b·x)

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Wave Superposition: sin(x) + a·sin(b·x)

Flowchart7 objects

Physics

Physics · L3 · Reflection, Refraction & Snell's Law · flowchart

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Physics · L3 · Reflection, Refraction & Snell's Law · flowchart

Collection4 items

01Physics · L1 · Balanced & Unbalanced Forces

02Physics · L1 · Balanced & Unbalanced Forces

03Physics · L1 · Ball Rolling on Grass vs Ice

+1 more

Physics

Physics · L1 · Balanced & Unbalanced Forces

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Physics · L1 · Balanced & Unbalanced Forces

Flowchart11 objects

Physics

Physics · L5 · Classifying a Phase Transition

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Physics · L5 · Classifying a Phase Transition

Quiz8 questions

For a reversible isothermal process at temperature T that absorbs heat Q, what is the entropy change of the system?

AΔS = QTBΔS = Q/TCΔS = T/QDΔS = 0, since energy is conserved

Physics

Physics · L4 · Entropy & Heat Engines — 8 Q

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Physics · L4 · Entropy & Heat Engines — 8 Q

Flowchart7 objects

Physics

Physics · L3 · Resistor Circuits · flowchart

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Physics · L3 · Resistor Circuits · flowchart

Flowchart5 objects

Physics

Physics · L5 · Quantum Optics: Coherent States and Cavity QED · flowchart

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Physics · L5 · Quantum Optics: Coherent States and Cavity QED · flowchart

Flowchart13 objects

Physics

Physics · L1 · Sorting Objects: Magnetic or Not?

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Physics · L1 · Sorting Objects: Magnetic or Not?

Note~340 words · 2 min

Drawing something invisible A magnet's pull can't be seen, but its shape can be mapped with field lines: imaginary lines showing which way a tiny compass needle would point at each spot, and how strong the field is there. Sprinkle iron fili

Physics