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1. ### Toboggan Speed Theory

Yes, and F=ma. Heavier people (assuming all else equal and that the fluid dynamics involved don't cause anything funky to happen) will accelerate faster than lighter people because the fixed force of air resistance will have less of an effect in terms of acceleration on the larger mass, but the...
2. ### Toboggan Speed Theory

Also, the force due to air friction slowing down the tobogganers is dependent on speed and surface area, not mass, but the force due to the combination of the normal force of the slope and gravity will be greater for heavier people, meaning heavier people of the same size and shape would be...
3. ### Sound Intenisty at a Football Game

I think it's safe to assume that everyone is located an equal distance from the center of the field (otherwise we'd need more information). The first trick is to look at the decibel scale. dB is a logarithmic scale in reference to the power of the sound. If the power of two sounds are power1...
4. ### Drag can happen in extremely low-viscosity fluids

Okay, here is my statement: "Even if the molecules in a fluid did not collide with each other, there would still be drag." It seems I misread some of the things russ_watters had posted, and thought he was arguing that Thomas2 was wrong that there would be drag if the molecules in a fluid did...
5. ### Drag can happen in extremely low-viscosity fluids

The balloon talk was necessary for people to understand the number of collisions of air molecules with you every second. Otherwise, my explanation of drag would have made little sense.
6. ### Drag can happen in extremely low-viscosity fluids

There is something called conservation of momentum. It exists. With an object moving through the air, we can assume the collision between the object and the air molecules is 100% elastic (otherwise we need to account for the heat generated in the deformation of the object and whatnot). Assuming...
7. ### Drag can happen in extremely low-viscosity fluids

First, let me introduce myself. I am new to these forums, but not new to sharing ideas that cause argument. If you think anything I say is wrong, please speak up. The reason I joined was because of this outrageous 2+ year old thread: https://www.physicsforums.com/showthread.php?t=70227 The...