| From: Walla ® | 8/28/01 5:26:02
PM |
| Subject: Second bounce spin | post id:
393228 |
| Why does a golf ball spin
backwards on the green on the second bounce, but not the first? Is it
something to do with momentum? Same thing seems to happen with a cricket
ball that is hit behind square. | |
| From: Grant¹ (Avatar) | 8/28/01 5:39:02
PM |
| Subject: re: Second bounce spin | post id:
393238 |
Why does a golf ball spin backwards on the green on the second bounce Have to admit, i've never seen it happen, and i'd expect the more bounces, the less likely it's be spinning backwards. Possibly it was already spinning backwards on the first bounce (if sliced), but it's not untill the 2nd bounce the spin becomes slow enough to see. | |
| From: Walla ® | 8/28/01 5:43:42
PM |
| Subject: re: Second bounce spin | post id:
393244 |
| I meant the ball moves backwards
on the green, ie against the original direction of the
shot. | |
| From: Grant¹ (Avatar) | 8/28/01 5:57:03
PM |
| Subject: re: Second bounce spin | post id:
393250 |
I meant the ball moves backwards on the green, ie against the original direction of the shot. OK. I have seen it occur on the first bounce, but this is only on a very short chipshot out of a bunker onto a green- the ball has plenty of back spin, and not much forward momentum, so it rolls backward once it hits the ground. With longer shots it probably has even more backspin, but it's forward momentum is even greater still, so the first bounce slows it's forward momentum considerably (but not enough to over come it's forward momentum), by the second it still has enough back spin to actually overcome the forward momemntum & so it spins back towards where it came from. That's my guess anyway. | |
| From: procrastination inc | 8/28/01 7:24:04
PM |
| Subject: re: Second bounce spin | post id:
393322 |
| Playing with a super ball, I've
noticed that the direction of spin changes with each bounce. If you put
sidways rotation on it, it will leap left to right on one bounce and on
the next right to left. This reduces, as does the rebound height with
every bounce. I don't think this would apply to golf balls. They wouldn't have the grip on the green to do that. They seem to behave like billiard balls in spin. When a billiard ball leaves the cue with back spin, it skids forward until it loses its forward momentum: a..before its spin is lost, where it rolls backward b..after its spin is lost, and it rolls forward c...as its spin is lost and stops short. Could be that on the first bounce, the golf balls forward speed is too high and the grip to low for the spin to effect the direction of travel. | |