OOAK Table Tennis Forum

pnach did not comprehend that there was a connection between the weight and power. He was arguing that there was only minimal connection and that those claiming they felt a larger influence than was explianed by his math were obviously in error. The error however was that he did not understand the limitations of his math as a representation of the real world. He assumed his math was the truth, when in fact the real world is the truth and he did not understand that his math assumption was leading him to erroneous conclusions about the real world.

In the real world, it is reduced energy losses during collision that results in faster rebound velocity, and these reduced energy losses are achieve by having higher stiffness in the blade. The higher stiffness is achieved by using stiffer materials which when choosing only from the limited materials allowed for TT blades, almost always results in higher mass. Thus making the blade stiffer makes it faster (i.e. higher COR) , but this increased COR requires that the blades mass be higher!..

Now some blades have been specifically constructed to have higher COR at lower mass (Ishlion) than most other blades, and pnach's used the Ishlion's speed to weight to argue that his math was right.....but.....his actual argument was that people who said there was a correlaton with weight were wrong.
Unfortunately he did not understand what he did not understand and in both cases he was wrong.

If you compare two different weight Ishlions, the heavier one will more often than not be stiffer and therefore faster, and that this correlation is true for all blades simply because the increase in stiffness is intimately coupled to the engineering properties of the materials used in blades. pnach did not know that COR was in the end correllated with blade weight for valid physical reasons. COR was for him an abstract constant not connected with blade weight.

The force of gravity has nothing to do with the earth's spin or any accelerations. Gravity is strictly a function of the mass.
The earth is not held together by spin. It is held together by gravity.

decoy - I think you are thinking faster than you are typing and perhaps end up saying the opposite of what you mean.
If you see an error after pressing submit, edit it and submit again.

apologies, you are right again. i tend to get sucked into the discussion and just go autopilot..

but wouldn't statement such as... take a planet such as earth sniping away as it is, then take a smaller planet ( less mass) but spinning at a faster rate( let say double the earths/ or perhaps 4 times more or is it to the power of 4,). the point is the smaler planet with the faster spin, would have the same gravitational pull as a planet like earth..

surely if the earth stoped spinning there would be a decrease in gravity.

i may be just sputtering nonsense. at least i can learn from what others say

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Main: / secondary / LP
Blade: DHS Hurricane hao/ Blade- Hurricane Hao 2
FH: Skyline 3(Blue Sponge)/ FH- Nittaku H3 pro
BH: Omega Asia/ BH- Calibra Tour H

Gravity depends on mass only. Spin does not change it. Spin will change what you feel because of centrifugal force countering it. Gravity remains fixed.
The moon does not spin, (technically one rev per, one orbit of the earth) but still has gravity based on the moons mass. Same side of the moon always faces earth. Most moons do this and there is a reason they are in sync with the planet they orbit.

Decoy -- Hookshot is exactly correct.

Lets look at gravity and centrifugal force a bit more. Stand on a scale right now and weigh yourself and lets say you weigh 160 lbs, and while still standing there, lets assume Hookshot is able to stop the earth from spinning (and stop everything on the earth with it at the same time), once the earth is stopped, you would see that you weigh about 165 lbs once the earth has stopped spinning. This is because the earths centrifugal force that was working against the pull of earth's gravity, has dropped to zero as the earth's rotation dropped to zero.

Hey:

It's a physics forum:)

Don't want to offend anyone but I'll take a swing at this one too:

I agree with the collision theory (momentum as I recall from university) that was mentioned on the first page (didnt have time to read the rest).

A heavier bat might be slower to swing but through a collision with a ball, the ball could travel with higher velocity. Thus, all things being equal, a heavier bat, will produce a faster ball despite a slower swing.

Of course I could be wrong...