An experiment starts with a question

By Physics you can picture · myAudience

myAudience · AI-generated illustration · Original generated illustration; not documentary evidence

Ask whether changing a toy car’s mass changes its acceleration under the same net force. Identify what you change, what you measure and what you try to keep constant. Real friction makes “the same push” hard to reproduce, so repeated measurements and uncertainty matter. This is a thinking exercise: design a safe tabletop test with a teacher, rather than treating one run as a universal law.