Books etc
Milli, micro, nano, and pico
Millie's shrinking formula was not chosen at random. Milli, micro, nano, and pico are prefixes (= a group of letters added before a word to modify its meaning) used in the measurement of smaller and smaller quantities. People are more familiar with the prefixes used in the measurements of larger an...…
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macroscopic concepts
Waves
Imagine you’re at the beach watching the sea. Waves in the water go up and down in a rolling motion. Waves aren’t just in water: there are waves in light and sound, and even in waves you can’t see, like radio waves.
What is a Wave?
A wave is just a way that energy moves from one place to anoth...…
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macroscopic concepts
Diffraction
When waves move toward the shore, they usually go in a straight line. But what if there’s something in the way, like a big rock sticking out of the water or an opening in a wall like in the image above? Instead of just stopping, some of the waves go around the rock or though the opening and spread...…
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macroscopic concepts
Measurement scales and vectors
We often talk about quantities and measurements. When we say Millie weighs 6 kilograms, her tail is 25 centimeters long, and today it’s 23 degrees, we are using numbers and units of measurement: kg, cm, and degrees Celsius. Each unit of measurement refers to a measurement scale. Here are some exampl...…
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macroscopic concepts
Angular momentum
Angular momentum is about how things spin. It's a sort of “spinning power” of something that’s turning or rotating. Big heavy things that spin quickly have a lot of spin power.
Imagine you’re on a playground merry-go-round. If you’re sitting near the edge, and the merry-go-round is spinning, you...…
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macroscopic concepts