Can you name the reasons for a ball to deviate in sport? by arbitrarychoice

Can you name the reasons for a ball to deviate in sport?

created by arbitrarychoice

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These are ten reasons for a sports ball to deviate from the path that it would take if no forces were acting on it apart from gravity and the normal force exerted by the floor/table etc.
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Example sports	Deviation method
many sports
many sports
golf, tennis
badminton
baseball, bowls
cricket, baseball
golf, cricket
cricket, tennis
American football, rugby ball
water polo

many sports
quidditch
none known
none known
none known
none known
rare
none known
none known
none known
none known
none known
snooker

none known

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Reasons balls deviate in sport Quiz

by arbitrarychoice

Created Oct 28, 2010 in Sports
Game Plays 160

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	arbitrarychoice:	Oct 28th, 2010 at 17:06 GMT	0 points
	Any suggestions? How many bonus answers can you get? Try anything, however outlandish. I may have thought of it...

	Freddie:	Oct 28th, 2010 at 17:51 GMT	0 points
	For the 'roundness' of ball one, I'd probably go with Rugby ball rather than a cricket ball. The cricket ball is round. Did you put it in because of the seam? It might not technically be round, but the Rugby ball is more of a clearer answer (and might help more people get it). How about deteriotation of a ball? In cricket when the balls are used often they deteriate in quality really quickly which has a big impact on their path.

	sinatra22:	Oct 28th, 2010 at 18:24 GMT	2 points
	wat

	javonzir:	Oct 28th, 2010 at 19:17 GMT	1 point
	should bias be added as an acceptable alternative to assymetric weight (Bowling)? Also for cue sports like snooker and pool when a cue ball with left/right spin makes contact with the object ball the object ball picks up some of that spin and can drift off the line it would have taken. The nap of the cloth can also have an effect on the balls (only noticeable at slow speeds).

	daHOOK:	Oct 28th, 2010 at 21:06 GMT	1 point
	Lack of spin is what makes a knuckleball so hard to hit/catch.

	arbitrarychoice:	Oct 28th, 2010 at 22:05 GMT	1 point
	OK. A problem with this quiz is that there are several broad catergories. javonzir - I've added bias for 'weighted balls'. @jahook, true but my understanding is that this means turbulence round the seams causes differences in air pressure which makes the ball deviate in flight. @Freddie I was trying to include movement of the seam for cricket. It is because the ball is not completely round that it moves. I have however done as you suggested if it makes things clearer.

	roseman:	Oct 29th, 2010 at 00:18 GMT	2 points
	Any Liverpool supporters want to suggest 'beach ball' as an alternative answer