Waves transfer energy without transferring matter. Properties of waves, the electromagnetic spectrum, Newton's laws and momentum.
Energy moving through a medium — without the medium moving with it.
Amplitude, frequency, wavelength and speed — the four key measures.
Two ways a wave can move — perpendicular or parallel.
From radio waves to gamma rays — all light, different energy.
Vibrations in matter — and why you can't hear in space.
Bouncing off surfaces and bending at boundaries.
Radio, medical imaging, Wi-Fi and more — waves at work.
The basics of motion — how fast, how far, how long.
An object keeps doing what it's doing — unless a force acts.
More force means more acceleration — but more mass means less.
Every action has an equal and opposite reaction.
The quantity of motion — and why it's conserved.