The principle of riding a swing
They know how, but they can’t tell the principle. “How can you go so high?” In the world, there are some principles are difficult to describe in words even if everyone knows…
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Science simulations
Force to move the pendulum
Tension by gravity In physics, tension is the force on a string connecting two objects. Generally, the tension is calculated from both ends toward the center.길이 \( l \)인 진자를 Let’s consider…
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“Free falling” or “Thrown to the horizontal direction”
How to use the simulation Drag the ball with your mouse to free fall it in the air. Drag your mouse on the cliff to observe the parabolic motion. You can change…
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Electric Transformer
* We assume an ideal transformer where the excitation current is “0”. A transformer is a device for simply changing the voltage of an alternating voltage. Transformers make it easy to change…
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Integral in physics
Definite integral In the 2D coordinate plane, definite integral is a way to find the area of a graph. The only simple way to get the area as the product of width…
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Kepler’s law
Kepler and Tycho Brahe There is an astronomer who must be mentioned before talking about Kepler (Johannes Kepler 1571 ~ 1630). That’s Tycho Brahe. Tycho Brahe (1546-1601) is a famous Danish astronomer.…
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Torricelli’s Experiment
* You have to wear gloves when handling mercury. Torricelli’s Experiment The first person to measure the magnitude of air pressure is Italian scientist Toricelli. He was filled with mercury (Hg) in…
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Mandelbrot Set
This simulation supports both pinch zoom and mouse scrolling. We recommend using the Chrome browser. (to get more processing speed) Imaginary number An imaginary number is consisted with a number that…
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What color does it look?
Three Primary Colors of Light Red, green, and blue are called the three primary colors of light. By combining the three colors of light properly, you can create any color. Red +…
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Heart Pulse Detector
How to use the Heart Pulse Detector Place your finger on the camera and make the entire camera screen red. This application uses the phenomenon that the color of the finger periodically…
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