Cursed Gravity
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Firstly, mass has a gravitational effect. It bends space time, so the more mass something has, the more it bends. From this is can extrapolated that the hammer hits the ground before the feather. Basic physics my friend. It is just a shame they do not actually teach this, and merely spout the same crapola about them landing at the same time. However... If a hammer is dropped from 10 metres and the time to impact is recorded, and the feather is dropped from 10 metres and the time recorded they will appear to be the same. This is because the mass differential between the hammer and the feather is so slight as to be negligible. No-one believe me? Here is a mind experiment. The hammer and the feather are both at 10 metres above the ground. HOWEVER, they are at opposite sides of the moon. Now the moon will pull upon them both, causing them to fall. And this is where it becomes obvious... The hammer has a mass that is pulling the moon, ever so slightly, toward it. The feather has a mass that is pulling the moon too, but as the mass of the hammer is greater, the moon will move toward it. This means that the hammer has less distance to fall, and the feather more. Therefore, if dropped at the same time, the hammer hits first. QED
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^]
It's just a shame nobody has been to the moon to try out the experiment...
MVVM# - See how I did MVVM my way ___________________________________________ Man, you're a god. - walterhevedeich 26/05/2011 .\\axxx (That's an 'M')
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or divide the force by the mass to get the acceleration.
Mark_Wallace wrote:
Changing the mass doesn't change the acceleration, and changing the acceleration doesn't change the mass.
It does when the force is constant.
Regards, Rob Philpott.
This isn't a pure Mathematics calculation, where any number can be varied. The velocities, in this case, are purely calculated values, which are derived from the values of properties of the hammer, the feather, any forces applied, and any frictional effects. Those don't change, and there is no way of unilaterally changing the value of the velocity derived from them. You can't just declare "I've decided that the velocity is twice as much when it's the hammer!", and expect the hammer to break the laws of Physics to meet the requirements of your declaration. There's a big line between Mathematical possibility and the practical application of Maths.
I wanna be a eunuchs developer! Pass me a bread knife!
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Mark_Wallace wrote:
Changing the mass doesn't change the acceleration
Beg to differ, it is why sports car manufacturers strive to lighten the vehicles. F=ma, or, a=F/m ergo, reduce mass, increase acceleration where the force is constant.
--------------------------------- I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave CCC Link[^]
You're talking about applying force to counter existing forces (i.e. inertia, frictional co-efficients, lack of banana peels, etc.) Gravity is attracting constantly all the time, making it one of the forces that you're countering by introducing vectors, so sure, if you apply more force per kilo to counter all the other forces, you'll improve the vector, but a car can only accelerate as fast as its engine can turn the wheels. A car that weighs less will (within reason) accelerate quicker because there is less mass to move in a vector across the other forces. Change the value of G, and the amount of force required to counter it also reduces, but again, you can only change the value of G theoretically (e.g by writing different numbers on paper), so it's another one-way equation, like the hammer/feather one.
I wanna be a eunuchs developer! Pass me a bread knife!
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I appear to have a hole in my understanding of basic physics. A hammer and a feather fall at the same rate on the moon. (I think they actually did this). But bearing in mind force is equal to mass times acceleration. Gravity is a constant force but the mass of a hammer is much greater than that of a feather, so acceleration should be different? It seems gravity ignores mass when it accelerates things. What's going on? Can someone please explain the painfully stupid thing I'm missing so I can get on with the day? I blame last night's Prosecco for this mental lapse.
Regards, Rob Philpott.
The difference in mass between the hammer and feather is negligible compared to that of the moon.