Physics · GCSE · Forces & Motion
Reaction time
Reaction timeFree1:28Heddy Score 3 of 7, below the standard
What you need to know
- Typical reaction times are between about 0.2 and 0.9 seconds.
- Reaction time can be measured by timing how far a dropped ruler falls before it is caught.
- Tiredness, alcohol, some drugs and distractions such as phones make reaction times longer, which increases thinking distance.
- Wet or icy roads, worn tyres and worn brakes reduce friction and increase braking distance.
In this clip
Runs 1:28, from 1:56 to 3:24 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 works339K views · Freesciencelessons 995K subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
Covers the exact GCSE points on stopping distance and reaction time in a short, well-organised lesson.
Freesciencelessons on YouTubechecked 2026-10-22
Plays from youtube-nocookie.com. No YouTube cookies until you press play.