Biology · KS3 Y8 · Human Body Systems
Joints as levers
Joints as leversFree7:05Heddy Score 3 of 7, below the standard
What you need to know
- Joints are where bones meet, and their shape decides which movements are possible.
- A hinge joint, such as the elbow, bends and straightens in one direction only.
- Ball-and-socket joints at the hip and shoulder allow movement in every direction; the shallower shoulder socket moves more freely but is less stable.
- A pivot joint in the forearm lets one bone rotate around another, which is how the forearm twists.
In this clip
Runs 7:05, from 1:10 to 8:15 of the full video.
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.3/7, Below the standard
See the seven stars
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · passed. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
Not enough students yet
Our own students' answers. These are what move ★7 Proven.On YouTube
How the Heddy Score works4.96M views · 105K likes · Proko 4.42M subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
Clear 3D demonstrations of hinge, ball-and-socket and pivot joints that show exactly how each one moves.
Proko on YouTubechecked 2026-10-22
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