MAKE THE PHYSICAL MODEL
Our tested ramp height was 25 cm; all nine runs reached the road end, so our next improvement is a longer road. A suggested classroom build plan follows. Dimensions below are starting suggestions, not verified measurements of our prototype. Adapt them to your car and available materials.
| Flat track | 100–150 cm long |
|---|---|
| Track width | Car width + 4–6 cm |
| Ramp length | 40–60 cm |
| Initial release height | 5–20 cm |
| Side rails | 2–3 cm high |
If the car reaches the catch box, use a longer road or a lower ramp. Do not record the catch-box position as its natural stopping distance.
Mark a centre line and attach side rails with enough clearance so the wheels do not rub them.
Support the ramp securely. Tape the bottom transition smoothly to the flat road to reduce bumps. Mark repeatable release positions.
Cut all three inserts to the same size. Fix each flat, with no loose edges. Keep the ramp material unchanged.
Place the measuring strip beside the road. Set 0 at the ramp exit. Choose one reference point on the car and use it for every measurement.
Make a movable “Our Prediction” flag beside the track. Add a soft catch box beyond the measuring area.
Check the car rolls freely and stays on the road. Adjust the ramp so it stops within the measurable flat section.
Use the same car and release method. Change only surface or release height, then calculate means and compare.