Originally Posted by Macnewsjunkie
jonshf do you really need to be reminded that air friction is a negligible effect with falling bodies that are solids like a phone or a rock? Galileo proved that over 500 years ago dropping rocks off the tower at Pisa. The force of impact will change, but not the acceleration by gravity which remains constant. All this device will do is estimate the rate of rotation and attempt to make the phone land on its side rather than it's face. To work it would need some estimate of how high up in the air the phone is located. I assume an estimate will work for most cases. So don't try and drop your phone off a building to see what will happen unless you have insurance.
You are both right and wrong. Air resistance is negligible over a short fall. But for long falls the object will reach what is called a terminal velocity. Where the force of air resistance is equal to the force of gravity.
Even a bullet has a terminal velocity which is much slower than the rate at which it was fired. By your argument, the bullet would accelerate forever (wrong). I am not sure if you have ever studied drag but the drag force is not linear. Basically, the faster you go, your drag increases much faster. So if the drag force is a pound for 10 ft/s. it may be 2.8 for 20ft/s. Make sense?
However, for a fall of 10 feet, it can be ignored. Maybe I am getting technical but if you are going to call someone out, you will have to be specific.