## What is JavaLab?

Free interactive science simulation written by JavaScript Simulates various natural phenomena Includes about Physics, Chemistry, Earth, Astronomy, Biology, Measurment, Mathmatics… No need to plugin add-ons Available on mobile devices and tablets also Free of charge / No membership About Author...

## Diurnal Motion of Sun

Diurnal Motion Fix the camera towards Polaris at night, shoot for a few hours, and you’ll see the stars move in a circle around Polaris. This movement of the stars in a circle once a day is called a diurnal...

## Distance of 1 pc(parsec)

2023.5.24 Update: Improved execution speed by modifying the algorithm. Parallax When an object is close to me, you can use a ruler to measure the distance. But, it isn’t easy to measure when the object is away from me. In...

## Hypocycloid

A hypocycloid is a special plane curve generated by the trace of a fixed point on a small circle that rolls within a larger circle. If the radius of a large circle is $$R$$, and the radius of a small...

## Hypocycloid drawing tool

This is a tool that draws a hypocycloid figure made on a 3D printer. For a description of the hypocycloid, see here(link). 3D print data The gear ratios are 24 for the external gear and 17, 14, and 11 for...

## Free Fall Motion Analysis

Why do light and heavy objects fall at the same time? The change in speed due to gravity is the same for all objects because the force and inertia acting on an object are proportional to the object’s mass. The...

2023.4.24 Update: Improved algorithm and added ‘data download’ function. Newton’s cradle Newton’s cradle consists of five iron balls, each hanging on two threads to prevent the ball from spinning. Originally Newton’s cradle was created to demonstrate Newton’s third law. If...

## Boyle’s Law 2

Drag the standard weight and place it on top of the piston. You can download graph data. Boyle’s Law Doubling the pressure of a gas reduces the volume of the gas by 1/2, and increasing the pressure of a gas...

## Mechanical Energy Conversion 2

Mechanical energy As the roller coaster descends from a high place, the height decreases, and the speed increases, so the potential energy decreases, and the kinetic energy increases. Therefore, potential energy is converted into kinetic energy while the roller coaster...

## Moment of Inertia

This simulation assumes that there is rolling friction and no sliding friction. The cylinder and cube assumed the density of iron (7.874 g/cm³). Why does a rolling object go down slower than an object that slides down? In conclusion, the...

## Hypocycloid 2

A hypocycloid is a special plane curve generated by the trace of a fixed point on a small circle that rolls within a larger circle. If the radius of a large circle is R, and the radius of a small...

## Graph of Constant Velocity Motion

The distance covered by an object moving at a constant speed increases proportionally with time. If the distance is plotted against time on a graph, it will result in a straight line with a slope that indicates the speed. A...

## “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 the horizontal speed by adjusting the drag speed....