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Old 03-09-2020, 11:51 AM
ALT-J ALT-J is offline
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Default 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?
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Old 03-09-2020, 12:04 PM
ToddL ToddL is offline
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It's about 1.716 Newtons.

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

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Old 03-09-2020, 12:04 PM
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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? )
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Old 03-09-2020, 12:14 PM
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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.

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Old 03-09-2020, 12:19 PM
ALT-J ALT-J is offline
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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.
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Old 03-09-2020, 12:29 PM
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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.
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Old 03-09-2020, 12:36 PM
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Quote:
Originally Posted by ThrowBot View Post
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.
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Old 03-09-2020, 12:52 PM
Steve West Steve West is offline
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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.

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Old 03-09-2020, 01:08 PM
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Quote:
Originally Posted by ALT-J View Post
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 View Post
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.

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Old 03-09-2020, 01:33 PM
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Do they not teach physics in school any more?
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