<p>Hugely versitile, simple, engaging practical to find students’ reaction times using <strong>just a 1m ruler</strong>!<br /> Designed for KS3 and KS4 but also adaptable for KS2 and KS5, this experiment is ideal to spice up Thinking Distances in GCSE physics/science. Students will appreciate just how long human reaction times can be, and see how far their ruler falls while reacting under certain conditions.<br /> It could also be used to teach experimental ideas such as random error, accuracy &amp; handling anomalies, being unbiased etc.<br /> For KS2 &amp; 3 detail can be removed for simplicity. For KS5 this is a great opportunity to explore error types, uncertainties and uncertainty propagation by finding range/2 and absolute/percentage error on t. If there is interest I can produce a KS5 resource for this experiment with OCR-A style questions.<br /> It should take around 10-20 minutes depending on the group and how you use the questions</p>