Our Research Project - Ball/Court Interaction

Ball/Court Interaction
(Page 6)

Ball/Court Interaction

In the chart below we laid the angle out to the right of the angle in so that we could easily compare the two. What do we observe? In all cases the angle out was greater than the angle in. Which court is fast and which is slow? We should be able to determine this from the magnitude (amount) of the difference in the angle in and the angle out. Here's a graph (remember you can click on most of the graph's to get a larger version) and the exact numbers.

Flat (No Spin) Ball - All Courts
Average Angle In and Angle Out

Court: Ball: Angle In: Angle Out: Difference

Green Clay Wilson US Open 26.8 37.5 10.7
Green Clay Wilson Clay 28.2 41.0 12.8
Red Clay Wilson US Open 26.5 37.5 11.0
Red Clay Roland Garros 24.3 34.7 10.4
Hard US Open 23.9 32.9 9.1
Grass US Open 24.9 29.4 4.5
Grass Wimbledon 24.2 28.6 4.4

Is this what we expected? YES! We expect grass to be fast , clay to be slow and hard court to be faster than the clay. The grass surface has a tendency to let the ball skid.

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