Re: [math-fun] "differential" in sports writing
Isn't the usual jargon "point spread" ? --Dan Thane wrote: ----- I'm no fan, but how to reformulate this one without getting all wordy? "Golden State had a higher point differential vs. Memphis than it did vs. the Pelicans, despite losing two games to the Grizzlies." -----
See current major league baseball standings at http://espn.go.com/mlb/standings/_/sort/pointdifferential See the column DIFF. If you pause your cursor over DIFF you will see that it means Run Differential.and it clearly means in this case Runs Scored - Runs Allowed. Clearly this could be specialized to apply to one team against just one other team instead of against all other teams. On Tue, May 19, 2015 at 12:00 AM, Dan Asimov <dasimov@earthlink.net> wrote:
Isn't the usual jargon "point spread" ?
--Dan
Thane wrote: ----- I'm no fan, but how to reformulate this one without getting all wordy?
"Golden State had a higher point differential vs. Memphis than it did vs. the Pelicans, despite losing two games to the Grizzlies." -----
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I’m reminded of “high rate of speed” making frequent appearances on the local police blotter. Gratuitous physics-babble, or was it truly “acceleration” that alerted the authorities? -Veit
On May 19, 2015, at 7:00 AM, W. Edwin Clark <wclark@mail.usf.edu> wrote:
See current major league baseball standings at http://espn.go.com/mlb/standings/_/sort/pointdifferential See the column DIFF. If you pause your cursor over DIFF you will see that it means Run Differential.and it clearly means in this case Runs Scored - Runs Allowed. Clearly this could be specialized to apply to one team against just one other team instead of against all other teams.
On Tue, May 19, 2015 at 12:00 AM, Dan Asimov <dasimov@earthlink.net> wrote:
Isn't the usual jargon "point spread" ?
--Dan
Thane wrote: ----- I'm no fan, but how to reformulate this one without getting all wordy?
"Golden State had a higher point differential vs. Memphis than it did vs. the Pelicans, despite losing two games to the Grizzlies." -----
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My driver's ed teacher taught us "Never accelerate when making a turn." I objected that, in the physics sense, it is impossible make a turn without accelerating. The teacher, who taught gym when he wasn't teaching driver's ed, wasn't amused. Jim Propp On Tuesday, May 19, 2015, Veit Elser <ve10@cornell.edu> wrote:
I’m reminded of “high rate of speed” making frequent appearances on the local police blotter. Gratuitous physics-babble, or was it truly “acceleration” that alerted the authorities?
-Veit
On May 19, 2015, at 7:00 AM, W. Edwin Clark <wclark@mail.usf.edu <javascript:;>> wrote:
See current major league baseball standings at http://espn.go.com/mlb/standings/_/sort/pointdifferential See the column DIFF. If you pause your cursor over DIFF you will see that it means Run Differential.and it clearly means in this case Runs Scored - Runs Allowed. Clearly this could be specialized to apply to one team against just one other team instead of against all other teams.
On Tue, May 19, 2015 at 12:00 AM, Dan Asimov <dasimov@earthlink.net <javascript:;>> wrote:
Isn't the usual jargon "point spread" ?
--Dan
Thane wrote: ----- I'm no fan, but how to reformulate this one without getting all wordy?
"Golden State had a higher point differential vs. Memphis than it did vs. the Pelicans, despite losing two games to the Grizzlies." -----
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I almost always step on the accelerator pedal when rounding a curve, just to maintain the same speed. ——Dan
On May 19, 2015, at 9:28 AM, James Propp <jamespropp@gmail.com> wrote:
My driver's ed teacher taught us "Never accelerate when making a turn." I objected that, in the physics sense, it is impossible make a turn without accelerating. The teacher, who taught gym when he wasn't teaching driver's ed, wasn't amused.
This is just when I'm on a highway with banked turns. Not on a flat road. ——Dan
On May 19, 2015, at 11:52 AM, Dan Asimov <asimov@msri.org> wrote:
I almost always step on the accelerator pedal when rounding a curve, just to maintain the same speed.
——Dan
On May 19, 2015, at 9:28 AM, James Propp <jamespropp@gmail.com> wrote:
My driver's ed teacher taught us "Never accelerate when making a turn." I objected that, in the physics sense, it is impossible make a turn without accelerating. The teacher, who taught gym when he wasn't teaching driver's ed, wasn't amused.
To provide lateral force tires must operate at a slight angle to the direction of travel and this produces a component opposite the direction motion, i.e. drag. So even on a flat turn it takes a little more power to maintain the same speed. Brent On 5/19/2015 1:46 PM, Dan Asimov wrote:
This is just when I'm on a highway with banked turns. Not on a flat road.
——Dan
On May 19, 2015, at 11:52 AM, Dan Asimov <asimov@msri.org> wrote:
I almost always step on the accelerator pedal when rounding a curve, just to maintain the same speed.
——Dan
On May 19, 2015, at 9:28 AM, James Propp <jamespropp@gmail.com> wrote:
My driver's ed teacher taught us "Never accelerate when making a turn." I objected that, in the physics sense, it is impossible make a turn without accelerating. The teacher, who taught gym when he wasn't teaching driver's ed, wasn't amused.
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And the TV news use of "optics" when they mean "appearance". Brent On 5/19/2015 8:48 AM, Veit Elser wrote:
I’m reminded of “high rate of speed” making frequent appearances on the local police blotter. Gratuitous physics-babble, or was it truly “acceleration” that alerted the authorities?
-Veit
On May 19, 2015, at 7:00 AM, W. Edwin Clark <wclark@mail.usf.edu> wrote:
See current major league baseball standings at http://espn.go.com/mlb/standings/_/sort/pointdifferential See the column DIFF. If you pause your cursor over DIFF you will see that it means Run Differential.and it clearly means in this case Runs Scored - Runs Allowed. Clearly this could be specialized to apply to one team against just one other team instead of against all other teams.
On Tue, May 19, 2015 at 12:00 AM, Dan Asimov <dasimov@earthlink.net> wrote:
Isn't the usual jargon "point spread" ?
--Dan
Thane wrote: ----- I'm no fan, but how to reformulate this one without getting all wordy?
"Golden State had a higher point differential vs. Memphis than it did vs. the Pelicans, despite losing two games to the Grizzlies." -----
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On 2015-05-19 08:48, Veit Elser wrote:
I’m reminded of “high rate of speed” making frequent appearances on the local police blotter. Gratuitous physics-babble, or was it truly “acceleration” that alerted the authorities?
-Veit
My leadfooted friend Ed Hudson advises that "acceleration, rather than speed, is likeliest to trip constabulary synapses." --rwg Fast drivers used to delicately accelerate a rear wheel drive car into a turn to drift the rear end out slightly so the engine could contribute some centripetal force. Is this theory now deprecated? On a cloverleaf, I've noticed a second order effect apparently due to the moment of inertia of my car about its vertical axis.
On May 19, 2015, at 7:00 AM, W. Edwin Clark <wclark@mail.usf.edu> wrote:
See current major league baseball standings at http://espn.go.com/mlb/standings/_/sort/pointdifferential See the column DIFF. If you pause your cursor over DIFF you will see that it means Run Differential.and it clearly means in this case Runs Scored - Runs Allowed. Clearly this could be specialized to apply to one team against just one other team instead of against all other teams.
On Tue, May 19, 2015 at 12:00 AM, Dan Asimov <dasimov@earthlink.net> wrote:
Isn't the usual jargon "point spread" ?
--Dan
Thane wrote: ----- I'm no fan, but how to reformulate this one without getting all wordy?
"Golden State had a higher point differential vs. Memphis than it did vs. the Pelicans, despite losing two games to the Grizzlies." -----
_______________________________________________
On 5/19/2015 11:38 AM, rwg wrote:
On 2015-05-19 08:48, Veit Elser wrote:
I’m reminded of “high rate of speed” making frequent appearances on the local police blotter. Gratuitous physics-babble, or was it truly “acceleration” that alerted the authorities?
-Veit
My leadfooted friend Ed Hudson advises that "acceleration, rather than speed, is likeliest to trip constabulary synapses." --rwg Fast drivers used to delicately accelerate a rear wheel drive car into a turn to drift the rear end out slightly so the engine could contribute some centripetal force. Is this theory now deprecated?
It works in low traction situations, e.g. dirt road, snow,... But on clean dry pavement it quickly overheats and wears out the tires, so it's not used deliberately in road racing.
On a cloverleaf, I've noticed a second order effect apparently due to the moment of inertia of my car about its vertical axis.
Racing cars are designed to minimize that moment of inertia. Back in the fifties the Spanish Pegaso sports car was designed with the opposite idea. They put the engine well forward and the transmission was built into the rear axle assembly. They were comfortable and stable, but not nimble. Brent
At 01:56 PM 5/19/2015, meekerdb wrote:
Fast drivers used to delicately accelerate a rear wheel drive car into a turn to drift the rear end out slightly so the engine could contribute some centripetal force. Is this theory now deprecated?
It works in low traction situations, e.g. dirt road, snow,...
But on clean dry pavement it quickly overheats and wears out the tires, so it's not used deliberately in road racing.
You can see this technique best on the dirt-racing cars, where the rear wheels are kicking up an enormous amount of dirt and are constantly skidding while the front wheels track the line. The car is often at a substantial angle to the tangent -- e.g., perhaps 20-30 degrees -- so the front wheels have to be turned in the _opposite_ direction just to stay on course. Also, check out "donuts": https://en.wikipedia.org/wiki/Doughnut_%28driving%29 I'm not so sure that this is a "theory", so much as the only way you can possibly get around a course very fast. More-or-less, this is the way rear-wheel drive cars behave. If you're going down a street & want to reverse direction -- e.g., getting away from a potential kidnapper/terrorist -- you simply don't have enough street width to do a normal U-turn. So you floor it, turn the front wheel slightly, and then pull hard on the handbrake. The rear wheels lock up & break loose, the car does a 180 about the front wheels, you release the handbrake, straighten out the front wheels, and floor it out of there. (This is a lot more difficult on American cars where the "emergency" brake is a foot pedal, and also latches!!) The action movie guys love, love, love this maneuver.
participants (8)
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Dan Asimov -
Dan Asimov -
Henry Baker -
James Propp -
meekerdb -
rwg -
Veit Elser -
W. Edwin Clark