Let the ball go on the left and it climbs back to the same height on the right — steep side, shallow side, doesn't matter. Lay the right side flat and there is no height left to climb, so the ball just keeps going.
Four balls leave the same height together — one dropped straight, three sent down ramps of 60°, 30° and 15°. They arrive at very different times and all at the same speed.
Both halves matter. The angle sets the acceleration, a = g sin θ, so the shallow ramp takes nearly four times as long as the drop. But the speed at the bottom is fixed by the height alone, so every lane lands on the same number. That is exactly why a ramp was useful to Galileo: it stretches a fall out far enough to time by hand without changing where it ends up.
Run the lanes one at a time using the chips — each lane's arrival time and speed stay on screen, so you can build the comparison up piece by piece before running them together.
Plotted against height dropped, all four traces lie on top of each other. Against time they fan apart and meet only at the end. Strobe marks equal time intervals, and the gaps grow 1, 3, 5, 7 — Galileo's own result, and the sign that the acceleration is steady. Different masses gives the balls 1, 2, 4 and 8 kg; nothing about the motion changes.
Both tabs use the same model, so their numbers agree. Speeds come from simple energy conservation, v = √(2gh). The ball's spin is drawn for realism but left out of the energy budget so the arithmetic stays checkable by hand. If the far ramp is too short the ball leaves the lip as a projectile, and the run ends where it meets the ground — no bounce is modelled.