The Electromagnetic Spectrum and Energy Sources
Visible light is only a tiny sliver of a much larger family of waves called the electromagnetic spectrum. From the radio waves that carry music to the gamma rays from space, all of these are the same kind of wave — they just differ in wavelength and energy. This lesson maps the spectrum and touches […]
Momentum, Work, and Simple Machines
This lesson pulls together three related ideas: momentum (the motion an object carries), work (using force to move something), and simple machines (tools that make work easier). Each has a clean definition, and together they round out mechanics on the test. Momentum Momentum is a measure of how hard it is to stop a moving […]
