Year 8 · Spring Second Half
Physics
6 lessons from 2 units.
Unit P6 · lessons 7 to 9 of 9
A wave carries energy across a room, an ocean or a steel girder and leaves everything where it found it. Follow that one idea from a bobbing buoy to a crack nobody can see.
Unit P7 · lessons 1 to 3 of 7
Light crosses empty space at three hundred million metres a second and travels in straight lines. Follow one of those lines into a mirror, a block of glass, a pinhole, an eye and a prism.
- 07Echoes, reflection and absorptionProcessThe same shout comes straight back at you off a cliff and vanishes without trace in a bedroom. Two things decide which happens: what the surface is made of, and how far away it is.Open this lesson
- 08Hearing and auditory rangeSystemThe words infrasound and ultrasound sound like two different kinds of sound. They are not. They are two statements about the ears of one particular animal, and that animal is us.Open this lesson
- 09Ultrasound at workSystemNothing about ultrasound is exotic. It is ordinary sound at a frequency our ears happen to stop short of — and every job it does is one of the two things any wave can do: deliver energy, or bring back information.Open this lesson
- 01Light travelsModelA flash and a bang leave the same hillside at the same instant and arrive six seconds apart. One of them needed air to get to you. The other did not need anything.Open this lesson
- 02Reflection: mirrors and scatteringModelA mirror and a sheet of paper send back about the same amount of light and obey exactly the same rule. Only one of them shows you your face, and the reason is the surface rather than the rule.Open this lesson
- 03RefractionProcessA straw in a glass of water is straight and looks broken. Every part of that illusion is doing exactly what it should — including your brain, which is making the only reasonable assumption available to it.Open this lesson
Back to all three sciences this half term The whole KS3 Physics course