Sound pitch and volume
Hz Height and loudness of the sound When we often say that a sound is ‘low’ or ‘high,’ we are referring to the height of the sound. The height of the sound is completely different from … more
Pressure, buoyancy, and gravity applied to a balloon
Assume the pressure inside and outside the balloon is equal at 1 atmosphere. For ease of calculation, the volume and mass of the balloon and string are assumed to be zero. Pressure on a Balloon In … more
Drinks in a straw aren’t pulled, they’re pushed.
Drinks in a straw aren’t pulled, they’re pushed. When we say ‘straw,’ most people picture liquid being sucked upward. But scientifically, that’s not what happens. The liquid doesn’t rise because of suction; it rises because the … more
Pressure and Pressing Area
Pressure is defined as the force applied per unit area. When the same force is applied to two different surfaces, the pressure depends on the size of the area: the larger the area, the smaller the … more
Video motion analysis (Multi-flash photography, Stroboscope)
This app is Web-based software that converts video footage of an object’s motion into multi-flash photography. This program analyzes the movement of objects captured on video frame by frame. It may not work on Apple devices … more
Buoyancy comparison
Why is the submerged volume important to understand buoyancy? It is so famous that the 3rd-century Greek philosopher Archimedes shouted “Eureka!” and ran out of the bathhouse naked. （What did Archimedes find out? – Quotations from … more
Connections of Neuron (nervous system, neural network)
About this simulation This simulation allows you to connect and test various neurons. Inspired by logic circuits, we created three types of neurons: ‘AND’, ‘OR’, and ‘NOT’. In reality, human Interneurons(association neurons) are much more complexly … more
Basic principles of step-down and step-up regulator circuits (DC-DC converters, DC transformers)
DC-DC converters Step-up and step-down circuits are types of DC-DC converters that convert an input voltage to a desired output voltage. Step-up circuits convert a low input voltage to a higher output voltage, while step-down circuits … more
Polarization
Polarizers are made of long-chained molecules which absorb light with electric fields. When you shine a light on a polarizer, only a part of the light is passed. The polarizing plate materials absorb only the electric … more
Reaction time measuring (visual, auditory, tactile)
Reaction time It takes a while for a person to react to a stimulus. This is because the signal needs time to be transmitted and processed. The reaction time for the three stimuli of visual, auditory, … more
Solar system making
Movement of the planets of the solar system The planets in the solar system receive gravity from the Sun and revolve around it due to this gravity. The following is a table of the orbital radius … more