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Physics: explore STEM content (page 4 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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Note~231 words · 1 min

How much heat does a temperature change cost? Specific heat is a material property It's the energy to lift 1 kg by 1°C. Water is the outlier. Worked: heating a pot of water 2 kg of water from 20°C to 80°C. Calorimetry is conservation of ene

Physics

Physics · L3 · Specific Heat & Calorimetry

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Physics · L3 · Specific Heat & Calorimetry

Flowchart8 objects

Physics

Physics · L4 · Thermodynamics: the four laws · flowchart

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Physics · L4 · Thermodynamics: the four laws · flowchart

Flashcards10 cards

State Bloch's theorem for an electron in a periodic crystal potential U(r).1 / 10

If U(r + a) = U(r) for every lattice vector a, the energy eigenstates take the form

Physics

Physics · L5 · Condensed Matter Physics

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Physics · L5 · Condensed Matter Physics

Note~389 words · 2 min

Magnetic all by itself A permanent magnet needs no electricity, no wires, no switch. A fridge magnet is one. That's the difference from an electromagnet, which is only magnetic while current flows. Poles That's why a bar magnet grabs paperc

Physics

Physics · L2 · Permanent Magnets & Field Lines

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Physics · L2 · Permanent Magnets & Field Lines

Note~459 words · 2 min

Two consequences of light being transverse Light's electric field oscillates across the direction of travel, not along it. Ask which way it points and you get polarization. Ask what happens when many slits interfere and you get diffraction

Physics

Physics · L4 · Wave Optics: Polarization & Diffraction Gratings

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Physics · L4 · Wave Optics: Polarization & Diffraction Gratings

Flowchart7 objects

Physics

Physics · L1 · Batteries & Circuits · flowchart

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Physics · L1 · Batteries & Circuits · flowchart

Quiz6 questions

The cosmological principle assumes the universe is, on large scales:

AStatic and unchangingBHomogeneous and isotropicCCentered on the Milky WayDInfinitely dense everywhere

Physics

Physics · L5 · Cosmology

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Physics · L5 · Cosmology

Collection2 items

01Physics · L4 · Kinematics — Motion in 1D & 2D

02Physics · L4 · Energy, Work & Momentum

Physics

Physics · L4 · Classical Mechanics

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Physics · L4 · Classical Mechanics

Flowchart13 objects

Physics

Physics · L4 · Solving a DC Circuit with Kirchhoff's Laws

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Physics · L4 · Solving a DC Circuit with Kirchhoff's Laws

Flowchart7 objects

Physics

Physics · L1 · Gravity & Falling · flowchart

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Physics · L1 · Gravity & Falling · flowchart

Flowchart11 objects

Physics

Physics · L3 · Building Resonance by Matching Frequencies

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Physics · L3 · Building Resonance by Matching Frequencies

Flowchart7 objects

Physics

Physics · L3 · Conservation of Momentum · flowchart

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Physics · L3 · Conservation of Momentum · flowchart

Flowchart15 objects

Physics

Physics · L3 · 1D Kinematics: The SUVAT Equations · flowchart

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Physics · L3 · 1D Kinematics: The SUVAT Equations · flowchart

Collection4 items

01Physics · L4 · Capacitance & Dielectrics

02Physics · L4 · Capacitance and dielectrics

03Physics · L4 · How a Dielectric Increases Capacitance

+1 more

Physics

Physics · L4 · Capacitance & Dielectrics

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Physics · L4 · Capacitance & Dielectrics

Flowchart11 objects

Physics

Physics · L2 · Light Bending From Air Into Water

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Physics · L2 · Light Bending From Air Into Water

Flashcards12 cards

State Bernoulli's equation for flow along a streamline.1 / 12

P + ½ρv² + ρgh = constant along a streamline, for steady, incompressible, non-viscous flow. It is a statement of energy conservation per unit volume: pressure energy, kinetic energy, and gravitational potential energy trade off against each other.

Physics

Physics · L4 · Fluid Mechanics

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Physics · L4 · Fluid Mechanics

Flowchart13 objects

Physics

Physics · L5 · Quantum Measurement Process

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Physics · L5 · Quantum Measurement Process

Note~345 words · 2 min

Sound bounces, like light Sound is a wave, so it reflects off surfaces. Bounce it off something hard and flat, far enough away, and it comes back as a delayed copy: an echo. It's also why a room full of soft furniture sounds dead while an e

Physics

Physics · L2 · Echoes, Sound Reflection & Sonar

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Physics · L2 · Echoes, Sound Reflection & Sonar

Flashcards8 cards

Define mechanical stress and give its SI unit.1 / 8

Stress σ = F/A, the force per unit cross-sectional area applied to a material. SI unit: Pa (pascal, N/m²) — the same unit as pressure, since both describe force distributed over area.

Physics

Physics · L4 · Elasticity — Stress, Strain & Young's Modulus

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Physics · L4 · Elasticity — Stress, Strain & Young's Modulus

Flashcards10 cards

What is n-type doping, and how does it introduce extra carriers?1 / 10

A pentavalent (Group V) impurity such as phosphorus or arsenic substitutes for a host atom (e.g. silicon, Group IV). Four of its five valence electrons form covalent bonds with neighbours; the fifth is only weakly bound to the donor ion, occupying a shallow donor level just below the conduction band edge. At room temperature it is thermally ionised into the conduction band, donating a free electron — the majority carrier in n-type material.

Physics

Physics · L5 · Condensed Matter Physics — Doping & the p–n Junction

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Physics · L5 · Condensed Matter Physics — Doping & the p–n Junction

Flowchart7 objects

Physics

Physics · L3 · Lenses & Optical Instruments · flowchart

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Physics · L3 · Lenses & Optical Instruments · flowchart

Flowchart9 objects

Physics

Physics · L3 · Torque & Rotational Equilibrium · flowchart

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Physics · L3 · Torque & Rotational Equilibrium · flowchart

Note~206 words · 1 min

Work has a strict meaning here Everyday "work" means effort. Physics work means a force moved something along the direction of that force. Push with 10 N, move it 2 m: 20 joules of work. The part that catches people out No movement means no

Physics