MrBadmusAI

Year 7 · Spring First Half

Physics

3 lessons from 1 unit.

Unit P4 · lessons 4 to 6 of 9

Forces

A force is never something one object has. It takes two, it is measured in newtons, and what an object actually responds to is whatever is left over when you have added them all up.

  1. 04What forces do to motionModelA resultant force does not make things move. It makes whatever they are already doing change — and that is a much stranger idea.Open this lesson
  2. 05FrictionProcessNothing about a crate changes when you start sliding it. So why is the hardest part of the whole job the first centimetre?Open this lesson
  3. 06Air and water resistanceSystemA skydiver falls for a minute and stops getting any faster. Nothing has caught them, and their weight has not changed by a single newton.Open this lesson

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