Disc Golf Course Review How do you calculate disc weight at a certain speed
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#1
03-09-2020, 11:51 AM
 ALT-J Par Member Join Date: Nov 2015 Posts: 110 Niced 37 Times in 24 Posts
How do you calculate disc weight at a certain speed

How much does a 175 g disc weigh in your hand just before the hit if the release speed is 80 mph?
#2
03-09-2020, 12:04 PM
 ToddL Double Eagle Member Join Date: Jun 2008 Location: Greenville, SC Years Playing: 24 Courses Played: 150 Throwing Style: RHBH Posts: 1,087 Niced 480 Times in 220 Posts

Oddly, it's the same weight as when its speed is 0 mph.

 Niced: (11)
#3
03-09-2020, 12:04 PM
 ray1970 Birdie Member Join Date: Jan 2020 Location: Denver Posts: 351 Niced 195 Times in 118 Posts

Im no scientist but 175 is 175. Throwing it faster doesnt make it any lighter.

( Now where can I hide before the scolding starts? )
#4
03-09-2020, 12:14 PM
 Monocacy Double Eagle Member Join Date: Jul 2010 Location: Maryland Years Playing: 20 Courses Played: 172 Throwing Style: RHBH Posts: 1,810 Niced 853 Times in 355 Posts

Mass is an inherent quality of an object.

Force = mass x acceleration

Weight = mass x gravity

Gravity varies on different planets, but DGCR does not list any extraplanetary courses (yet?).

I assume the OP is asking about the force required to accelerate a disc to 80 mph, which will vary depending on the disc's mass.

 Niced: (2)
#5
03-09-2020, 12:19 PM
 ALT-J Par Member Join Date: Nov 2015 Posts: 110 Niced 37 Times in 24 Posts

I kinda knew this was coming because I could not state the question properly because I dont know physics too well. But everyone knows a disc will feel very heavy for a split second in a good throw and objects inside the car become heavier in a crash etc. Thats the phenomena I tried to describe. Dont know what the actual name for it is.
#6
03-09-2020, 12:29 PM
 ThrowBot Double Eagle Member Join Date: Jun 2015 Location: Billings, MT Years Playing: 13.9 Courses Played: 145 Throwing Style: RHFH Posts: 1,607 Niced 1,116 Times in 475 Posts

The "weight" you feel at the hit is proportionate to how quickly you're accelerating the disc. Also proportionate to the disc's mass.

So even knowing the max speed (e.g. 80 mph) is not enough to calculate that force. You need to know how long it takes to get from 0 to 80 mph.

And even then, you're looking at an average over the acceleration period. Instantaneous forces will be higher at times.

...And also this is all in linear terms so far. Imparting spin on the disc involves more considerations.

Last edited by ThrowBot; 03-09-2020 at 12:31 PM. Reason: And yes, it is possible to spin a disc. Don't listen to ODRB. That guy is @\$#& dumb.
#7
03-09-2020, 12:36 PM
 ALT-J Par Member Join Date: Nov 2015 Posts: 110 Niced 37 Times in 24 Posts

Quote:
 Originally Posted by ThrowBot The "weight" you feel at the hit is proportionate to how quickly you're accelerating the disc. Also proportionate to the disc's mass. So even knowing the max speed (e.g. 80 mph) is not enough to calculate that force. You need to know how long it takes to get from 0 to 80 mph. And even then, you're looking at an average over the acceleration period. Instantaneous forces will be higher at times. ...And also this is all in linear terms so far. Imparting spin on the disc involves more considerations.
Okay so that sounds like a very complex thing . Maybe too complex for anyone to actually calculate it on a case. So basically the faster you accelerate it, the heavier it becomes? And if I read correctly along the lines, its just much easier for amateurs to make a slower acceleration to not slip before the hit and keep it under control? The whole pondering started from a conversation with a friend who claims that his grip and core strenght is not enough to hold the disc longer. So basically trying to proove him wrong here. I know its more of a form/balance issue.
#8
03-09-2020, 12:52 PM
 Steve West Par Delusionary Join Date: Dec 2009 Years Playing: 46 Courses Played: 387 Posts: 5,191 Niced 1,904 Times in 932 Posts

Plugging 85 mph into Einstein's relativistic formula for how mass increases as speed increases, you get an increase in mass of one 718,048,409,976th of a gram for a 175 gram disc.

 Niced: (5)
#9
03-09-2020, 01:08 PM
 ThrowBot Double Eagle Member Join Date: Jun 2015 Location: Billings, MT Years Playing: 13.9 Courses Played: 145 Throwing Style: RHFH Posts: 1,607 Niced 1,116 Times in 475 Posts

Quote:
 Originally Posted by ALT-J Okay so that sounds like a very complex thing . Maybe too complex for anyone to actually calculate it on a case. So basically the faster you accelerate it, the heavier it becomes? And if I read correctly along the lines, its just much easier for amateurs to make a slower acceleration to not slip before the hit and keep it under control? The whole pondering started from a conversation with a friend who claims that his grip and core strenght is not enough to hold the disc longer. So basically trying to proove him wrong here. I know its more of a form/balance issue.
Ha, funny. I'd agree that it's more to do with technique than raw strength. But you do want the disc to "rip" out of your hand on most drives, rather than trying to time when you let go.

Quote:
 Originally Posted by Steve West Plugging 85 mph into Einstein's relativistic formula for how mass increases as speed increases, you get an increase in mass of one 718,048,409,976th of a gram for a 175 gram disc.
A value calculable but negligible. And I almost took it there, but that's pretty clearly not what the OP had in mind.

 Niced: (1)

#10
03-09-2020, 01:33 PM
 R-Ogre Eagle Member Join Date: Jun 2019 Location: Juneau, AK Posts: 552 Niced 730 Times in 270 Posts

Do they not teach physics in school any more?

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