Physics Help Forum Acceleration and Gravity.

 Special and General Relativity Special and General Relativity Physics Help Forum

 Jul 9th 2017, 06:42 AM #1 Senior Member     Join Date: Feb 2017 Posts: 205 Acceleration and Gravity. If a person is in an elevator that is going down then this person will feel weightless as though there is no gravity at all. This would be similar to a person in space he would also feel weightless as there is no gravity in space. But if a spaceship moves out of our atmosphere and the spaceship accelerates upwards at 9.8 m/sē. this is exactly the gravitational constant so if a astronaut in this spaceship throws a feather and a ball at the same time they will come down at the same time. So does this prove that if a object falls down it would be similar as having no gravity force acting on it but if an object accelerates upwards the gravity would be felt. I mean the object will feel an effect like that of gravitation when the object accelerates upwards? When acceleration is in negative direction i.e downwards the gravitational pull is also negative as though you were in space. So when acceleration is positive that is upwards gravitational pull is also positive. Is this correct? Last edited by avito009; Jul 9th 2017 at 07:18 AM.
 Jul 9th 2017, 07:47 AM #2 Senior Member     Join Date: Feb 2017 Posts: 205 Why do we feel weightless? We feel weightless when we fall down towards the earth because the acceleration due to gravity equals the earths gravitational field. Is this right?
 Jul 9th 2017, 04:10 PM #3 Senior Member   Join Date: Apr 2017 Posts: 506 Yes ...I think everything in those two posts is correct....

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