Thin Film Interference
Interference patterns seen in thin films If a thin oil film is floating on the water, you will see a beautiful pattern appear on the oil film. This is because the two waves interfere with each other. One wave is … more
Why does the moon seem to follow me?
Is the moon really following me? How can you explain that the moon looks follow I? The moon doesn’t follow me. For example, if I go forward with a car, the landscape seems to move backward. If the vehicle moves … more
Little Prince’s Trampoline
Law of action and reaction When we apply force to an object, that object also exerts the same amount of force on us. At this time, our force is ‘action,’ and the force exerted on us by the object is … more
Triangle Trick
Triangle Trick If you look closely, you can see that the triangle’s slope is not a straight line. One of the merged triangles is slightly convex up, and the other is somewhat concave down. However, the convexity and concaveness are … more
What is the fastest at the moment of hitting the ground? (Terminal Velocity)
Mechanical energy Mechanical energy is the sum of potential and kinetic energy. Mechanical energy = potential energy + kinetic energy Em = EP + EK Mechanical energy conservation Without friction, the sum of an object’s initial mechanical energy is equal … more
Surface Tension
Surface tension Surface tension is a type of force that acts to minimize the surface of liquids. Liquid molecules are pulling together with other molecules around them. This force is called a ‘cohesive force.’ On the other hand, molecules on … more
Color Panel
Selecting the button to changes the background color. Use it when you need a specific color in various scientific experiments.
Stellar Classification
Surface temperature and color of object When the iron is heated, it is initially dark red, but as the iron’s temperature rises, it gradually takes on a yellowish color. This is because the light emitted by the iron changes as … more
See the Light
Even if the object does not shine by itself, why can we see it? The eye is the organ that feels light. Even if the object does not shine by itself, why can we see it? Most objects can reflect … more
Why is the Sky Blue?
What is the size of the light? There is no exact concept of sizing the light, but it uses the wavelength of the light. Wavelength is the distance traveled by a wave before it vibrates once and returns to its … more
Standing Waves in various situations
A standing wave occurs when incoming and reflected waves interfere with each other. It produces a wave pattern that appears to be stationary. Nodes are locations where particles of the medium appear to be at rest. And, antinodes are locations … more
Pulleys with Many Wire
Movable Pulley Movable pulleys can move axes, unlike fixed pulleys. Movable pulleys have the advantage of being able to move with less force. But, the distance that I have to move is longer than the fixed pulley. So, there is … more