MrBadmusAI

Year 9 · Summer Second Half

Physics

3 lessons from 1 unit.

Unit P12 · lessons 4 to 6 of 6

Space

Gravity never switches off and never pushes. Follow it from a bathroom scale that measures newtons and prints kilograms, out to the pull between the Earth and the Sun, and on to a ruler made of light.

  1. 04The Sun, stars and galaxiesSystemEverything you can see with your eyes on a dark night, apart from a smudge or two, is inside one galaxy out of two trillion. Getting the sizes of things straight is most of the work.Open this lesson
  2. 05Seasons and the tiltModelThe Earth is five million kilometres closer to the Sun in January than in July, and January is the cold one. Whatever causes seasons, it is not how far away we are.Open this lesson
  3. 06How far is a light year?QuantitativeIt sounds like a length of time and it is a distance. Getting that one word straight is the difference between understanding the scale of the universe and having no idea at all.Open this lesson

Back to all three sciences this half term The whole KS3 Physics course