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  <title>Tracé blog</title><link>https://traceanim.com/blog/</link><description>Teaching maths and science with animation</description><language>en</language>
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  <item><title>How to Create Math Slides (Step by Step)</title><link>https://traceanim.com/blog/how-to-create-math-slides</link><guid>https://traceanim.com/blog/how-to-create-math-slides</guid>
    <pubDate>Sat, 24 Oct 2026 08:00:00 +0000</pubDate><description>Create math slides that move: type an equation, get its graph, add a live slider, reveal each step on a click and present. A free, step-by-step guide.</description></item>
  <item><title>Why 45° Is the Best Launch Angle (and When It Isn’t)</title><link>https://traceanim.com/blog/best-launch-angle-45-degrees</link><guid>https://traceanim.com/blog/best-launch-angle-45-degrees</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>The proof that 45° gives the longest throw, why 30° and 60° land in the same place, and why real throws use less: launch height and air resistance.</description></item>
  <item><title>The Brachistochrone: Why the Fastest Path Is a Curve</title><link>https://traceanim.com/blog/brachistochrone-curve</link><guid>https://traceanim.com/blog/brachistochrone-curve</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Why a ball on a cycloid beats one on a straight ramp (3.17 s against 3.76 s for a 20 m drop), the 1696 challenge behind it, and how to animate the race.</description></item>
  <item><title>Fourier Series: How Sine Waves Build a Square Wave</title><link>https://traceanim.com/blog/fourier-series-square-wave</link><guid>https://traceanim.com/blog/fourier-series-square-wave</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Add sin x, sin 3x / 3, sin 5x / 5… and a square wave appears. The formula, why only odd harmonics, the 9% Gibbs overshoot, and a click-by-click slide.</description></item>
  <item><title>Interactive Maths Slides: Beyond PowerPoint for Teachers</title><link>https://traceanim.com/blog/interactive-math-slides</link><guid>https://traceanim.com/blog/interactive-math-slides</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>What makes a maths slide interactive, what PowerPoint, GeoGebra and Desmos each do well, and how to build click-by-click slides with live sliders.</description></item>
  <item><title>Pythagorean Theorem Lesson: A Visual Proof in 5 Clicks</title><link>https://traceanim.com/blog/pythagorean-theorem-lesson</link><guid>https://traceanim.com/blog/pythagorean-theorem-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>A ready-to-teach Pythagorean theorem lesson: the areas picture, a proof students can follow, common mistakes, check questions, and how to animate it.</description></item>
  <item><title>Teaching Slope and y = mx + b: An Animated Lesson Plan</title><link>https://traceanim.com/blog/slope-y-mx-b-lesson</link><guid>https://traceanim.com/blog/slope-y-mx-b-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>A slope lesson students can see: rise over run, what m and b do to a line, the usual mistakes, check questions, and live sliders for m and b.</description></item>
  <item><title>The Unit Circle Lesson: Where Sine and Cosine Come From</title><link>https://traceanim.com/blog/unit-circle-lesson</link><guid>https://traceanim.com/blog/unit-circle-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>A unit circle lesson plan: sine and cosine as coordinates, special angles, signs in each quadrant, the sine wave unrolled, common mistakes and checks.</description></item>
  <item><title>Free-Body Diagrams and Newton’s Second Law: A Lesson Plan</title><link>https://traceanim.com/blog/free-body-diagram-newtons-second-law</link><guid>https://traceanim.com/blog/free-body-diagram-newtons-second-law</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>How to teach free-body diagrams step by step, a worked example (30 N push, 10 N friction, 5 kg: a = 4 m/s²), the classic mistakes and check questions.</description></item>
  <item><title>Solving Linear Equations: A Step-by-Step Lesson Plan</title><link>https://traceanim.com/blog/solving-linear-equations-lesson</link><guid>https://traceanim.com/blog/solving-linear-equations-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach solving linear equations as undoing steps: a balance-based lesson, worked examples, the classic sign mistakes, check questions and animated steps.</description></item>
  <item><title>Solving Quadratic Equations by Factoring: Lesson Plan</title><link>https://traceanim.com/blog/solving-quadratic-equations-factoring</link><guid>https://traceanim.com/blog/solving-quadratic-equations-factoring</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Solve quadratic equations by factoring: the zero-product rule, the product–sum method, a worked example, common mistakes and checks, with the graph alongside.</description></item>
  <item><title>Graphing Quadratic Functions in Vertex Form: Lesson Plan</title><link>https://traceanim.com/blog/graphing-quadratic-functions-vertex-form</link><guid>https://traceanim.com/blog/graphing-quadratic-functions-vertex-form</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach vertex form y = a(x − h)² + k: what a, h and k do to a parabola, completing the square, the sign trap with h, and live sliders to explore it.</description></item>
  <item><title>The Derivative as the Slope of a Tangent: Lesson Plan</title><link>https://traceanim.com/blog/derivative-slope-of-tangent-line</link><guid>https://traceanim.com/blog/derivative-slope-of-tangent-line</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Introduce the derivative as the slope of the tangent line: secants that shrink, the limit (f(x+h) − f(x))/h, a worked example with x², mistakes and checks.</description></item>
  <item><title>Riemann Sums: Teaching the Area Under a Curve</title><link>https://traceanim.com/blog/riemann-sums-area-under-curve</link><guid>https://traceanim.com/blog/riemann-sums-area-under-curve</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>A Riemann sums lesson: left, right and midpoint rectangles under y = x², exact numbers for 8 rectangles, how the error shrinks, mistakes and checks.</description></item>
  <item><title>Taylor Series: Approximating Functions with Polynomials</title><link>https://traceanim.com/blog/taylor-series-approximation</link><guid>https://traceanim.com/blog/taylor-series-approximation</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>How Taylor series build eˣ and sin x from polynomials term by term, how accurate a few terms are, the small-angle approximation, and a click-by-click slide.</description></item>
  <item><title>Exponential Growth and Decay: A Lesson Plan</title><link>https://traceanim.com/blog/exponential-growth-decay-lesson</link><guid>https://traceanim.com/blog/exponential-growth-decay-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach exponential growth and decay with y = a·bˣ: doubling, half-life, compound interest, why exponential beats x², common mistakes and check questions.</description></item>
  <item><title>Solving Systems of Equations by Graphing: Lesson Plan</title><link>https://traceanim.com/blog/systems-of-equations-graphing</link><guid>https://traceanim.com/blog/systems-of-equations-graphing</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach systems of linear equations by graphing: the intersection as the solution, one, none or infinitely many solutions, substitution as a check, and mistakes.</description></item>
  <item><title>Expanding Brackets and (a + b)²: An Area Model Lesson</title><link>https://traceanim.com/blog/expanding-brackets-lesson</link><guid>https://traceanim.com/blog/expanding-brackets-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach expanding brackets with the area model: why (a + b)² = a² + 2ab + b², not a² + b², the difference of two squares, mistakes and check questions.</description></item>
  <item><title>Adding Vectors Head to Tail: A Lesson Plan</title><link>https://traceanim.com/blog/adding-vectors-head-to-tail</link><guid>https://traceanim.com/blog/adding-vectors-head-to-tail</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach vector addition: head-to-tail drawings, adding components, the magnitude with Pythagoras, a river-crossing example, common mistakes and checks.</description></item>
  <item><title>The Simple Pendulum Period: T = 2π√(L/g) Lesson Plan</title><link>https://traceanim.com/blog/simple-pendulum-period</link><guid>https://traceanim.com/blog/simple-pendulum-period</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach the simple pendulum period formula T = 2π√(L/g): what changes the period and what does not, the small-angle limit, worked examples and checks.</description></item>
  <item><title>Wave Speed, Frequency and Wavelength: v = fλ Lesson</title><link>https://traceanim.com/blog/wave-speed-equation-lesson</link><guid>https://traceanim.com/blog/wave-speed-equation-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach the wave equation v = fλ: wavelength, frequency, period and amplitude on one animated wave, examples with sound and light, mistakes and checks.</description></item>
  <item><title>Circular Orbits and Gravity: Why Satellites Don’t Fall</title><link>https://traceanim.com/blog/circular-orbit-speed-lesson</link><guid>https://traceanim.com/blog/circular-orbit-speed-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>A lesson on circular orbits: gravity as the centripetal force, orbital speed v = √(GM/r), the ISS at 7.7 km/s and 92 minutes, geostationary orbit, and mistakes.</description></item>
  <item><title>Ohm’s Law and Simple Circuits: A Lesson Plan</title><link>https://traceanim.com/blog/ohms-law-circuits-lesson</link><guid>https://traceanim.com/blog/ohms-law-circuits-lesson</guid>
    <pubDate>Fri, 23 Oct 2026 08:00:00 +0000</pubDate><description>Teach Ohm’s law V = IR with a live circuit: current, voltage, resistance, series and parallel resistors, power, the classic misconceptions and checks.</description></item>
  <item><title>Custom Maths Animations in a Few Lines, No Code</title><link>https://traceanim.com/blog/custom-math-animations</link><guid>https://traceanim.com/blog/custom-math-animations</guid>
    <pubDate>Wed, 21 Oct 2026 08:00:00 +0000</pubDate><description>Points, vectors and curves that move with time: write a rolling wheel or a sliding ladder in six lines of calculator maths, or let the AI write it.</description></item>
  <item><title>How to Animate Maths for Teaching, Without Code</title><link>https://traceanim.com/blog/animate-math-without-code</link><guid>https://traceanim.com/blog/animate-math-without-code</guid>
    <pubDate>Tue, 20 Oct 2026 08:00:00 +0000</pubDate><description>A practical guide to animated maths slides: what to animate, how to reveal ideas one click at a time, and how to build it without Python or Manim.</description></item>
  <item><title>Newton's Method, Animated: One Tangent per Click</title><link>https://traceanim.com/blog/newtons-method-animation</link><guid>https://traceanim.com/blog/newtons-method-animation</guid>
    <pubDate>Tue, 20 Oct 2026 08:00:00 +0000</pubDate><description>Teach Newton's method visually: follow each tangent down to the x-axis, compare it with bisection, and see why it converges so fast, or fails.</description></item>
  <item><title>Euler's Method and Direction Fields, Visually</title><link>https://traceanim.com/blog/euler-method-direction-fields</link><guid>https://traceanim.com/blog/euler-method-direction-fields</guid>
    <pubDate>Tue, 20 Oct 2026 08:00:00 +0000</pubDate><description>A visual lesson on differential equations: draw the direction field, follow solution curves, then watch Euler’s method step away from the exact solution.</description></item>
  <item><title>QAM Constellation Diagrams, Explained (BPSK to 256-QAM)</title><link>https://traceanim.com/blog/qam-constellation-diagrams</link><guid>https://traceanim.com/blog/qam-constellation-diagrams</guid>
    <pubDate>Tue, 20 Oct 2026 08:00:00 +0000</pubDate><description>What a constellation diagram shows, why 256-QAM needs a cleaner channel than QPSK, Gray coding, noise and phase errors, with animated examples.</description></item>
  <item><title>How to Explain the TCP Three-Way Handshake</title><link>https://traceanim.com/blog/tcp-three-way-handshake-diagram</link><guid>https://traceanim.com/blog/tcp-three-way-handshake-diagram</guid>
    <pubDate>Tue, 20 Oct 2026 08:00:00 +0000</pubDate><description>Teach the TCP handshake with a sequence diagram that plays one message per click: SYN, SYN-ACK, ACK, sequence numbers, and what happens when a packet is lost.</description></item>
  <item><title>Fractals in the Classroom: Koch, Sierpinski, Mandelbrot</title><link>https://traceanim.com/blog/fractals-in-the-classroom</link><guid>https://traceanim.com/blog/fractals-in-the-classroom</guid>
    <pubDate>Tue, 20 Oct 2026 08:00:00 +0000</pubDate><description>Three fractals that hook a class: the Koch snowflake step by step, the Sierpinski triangle and the Mandelbrot set, with the maths behind each.</description></item>
  <item><title>The Logistic Map: Teaching the Road to Chaos</title><link>https://traceanim.com/blog/logistic-map-chaos</link><guid>https://traceanim.com/blog/logistic-map-chaos</guid>
    <pubDate>Tue, 20 Oct 2026 08:00:00 +0000</pubDate><description>One simple rule, x → r x (1 − x), goes from a steady state to cycles to chaos as r grows. Cobweb diagrams and the bifurcation diagram, explained.</description></item>
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