New balls, please.
Streamlines around a new (top) and a worn (bottom) non-spinning tennis ball. The shorter nap of the worn tennis ball decreases the drag coefficient causing the ball to speed up.
A community website from IOP Publishing
A community website from IOP Publishing
Streamlines around a new (top) and a worn (bottom) non-spinning tennis ball. The shorter nap of the worn tennis ball decreases the drag coefficient causing the ball to speed up.