Bounce on Grass vs. Turf
World Cup Physics
Drop a ball, watch it bounce and roll — pick grass, turf, or wet grass and see how the surface alone changes the outcome.
What to try
- Drop from 5 m with no horizontal speed on grass — count the bounces, then switch to turf and notice the count grows.
- Set 5 m drop and 12 m/s horizontal — turf carries the ball noticeably further than wet grass before stopping.
- Compare the energy-retained readout on the first bounce across the three surfaces — that single ratio drives all the downstream differences.
How this simulation works
Use the Drop Height slider to set how high the ball starts above the ground (1–5 m). Use the Horizontal Speed slider to give it a sideways velocity at release (0–15 m/s — zero is a vertical drop). Use the Surface slider to switch between Grass (mid-range bounce, moderate roll), Turf (livelier bounce, longer roll), and Wet Grass (deadened bounce, short roll). Press Start to release the ball; gravity carries it down, each ground contact uses the surface's coefficient of restitution, and once the ball has lost enough vertical speed it transitions to rolling friction and decelerates to a stop.