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Thread ID: 55171	2005-03-04 17:05:00	Are you accelerating now?	Renmoo (66)	PC World Chat

Post ID	Timestamp	Content	User
330631	2005-03-04 17:05:00	Hey guys, You are now sitting in front of the computer, not moving. Do you consider yourself accelerating now? This is because acceleration is a measure of change of velocity, which in turn is a change of displacement. Displacement involves change of magnitude and direction. Thus, the earth is rotating and you are changing your displacement (direction changing, or is it?) and this will led to change of velocity and acceleration. Any opinions or ideas. Cheers	Renmoo (66)
330632	2005-03-04 18:25:00	"you" are not accelerating as you would be measuring the displacement/velocity relative to what you would consider a "stationary" object eg. a thing on the surface of the earth. BUT, you are part of an accelerating "system". My opinion anyway.	somebody (208)
330633	2005-03-04 18:54:00	Hey guys, You are now sitting in front of the computer, not moving. Do you consider yourself accelerating now? This is because acceleration is a measure of change of velocity, which in turn is a change of displacement. Displacement involves change of magnitude and direction. Thus, the earth is rotating and you are changing your displacement (direction changing, or is it?) and this will led to change of velocity and acceleration. Any opinions or ideas. Cheers Acceleration manifests itself by way of force, force = mass times acceleration. Now whether you are sitting in fron of your computer, or whether you are a satelite orbiting around the earth at a uniform circumferential velocity, you are still experiencing a radial acceleration. If you are in a closed lift, and you drop an object, you may measure an acceleration f. Newton would have deduced that you then have an absolute acceleration (g-f), where g is the acceleration due to gravity. But Relativity will say you are in a place where the force of gravity is f. You cannot determine the absolute acceleration of the frame of reference.	Terry Porritt (14)
330634	2005-03-04 21:10:00	Acceleration manifests itself by way of force, force = mass times acceleration. Now whether you are sitting in fron of your computer, or whether you are a satelite orbiting around the earth at a uniform circumferential velocity, you are still experiencing a radial acceleration. If you are in a closed lift, and you drop an object, you may measure an acceleration f. Newton would have deduced that you then have an absolute acceleration (g-f), where g is the acceleration due to gravity. But Relativity will say you are in a place where the force of gravity is f. You cannot determine the absolute acceleration of the frame of reference. Well i'll go to our house.	Cicero (40)
330635	2005-03-05 02:19:00	You weigh a bit less than you would be if the earth wasn't spinning and thus moving you in a circle. The radial acceleration caused by this motion works in the opposite direction to the the gravitational acceleration. A satellite is at an altitude where the radial acceleration balances the gravitational acceleration, so it is "weightless". It still has mass.;) If you are in the satellite, you have mass too, even though you are floating, weightless. It takes force to start you moving, and force to stop you moving(relative to the satellite--- your frame of reference).	Graham L (2)
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