All Questions
Tagged with gravity acceleration
184
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Cause of Coordinate Acceleration in Free Fall [duplicate]
So I understand that objects in free fall are in an inertial frame, at rest in terms of relativity. However, from a person on the surface of earth, a falling apple is accelerating constantly until it ...
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Why does a ball bounce back even when it is released and not thrown?
So according to my understanding when we thrown a ball towards ground we apply an additional amount of force which results in an acceleration greater than the one due to earth. When this ball reaches ...
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Is it possible to know if you're moving or standing still due to the definition of Einsteins equivalence principle?
I have a question regarding Einstein's theory of relativity.
Einstein's equivalence principle states that locally it's not possible to tell if you're accelerating or being stationary in a ...
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Confusion over what constitutes a uniform gravitational field in relativity
Suppose we have some observer moving upwards with a constant proper acceleration, by the equivalence principle this is the same as the observer remaining stationary in a gravitational field, like ...
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When we are on the ground do we still accelerate with 9.8 m/s²? [duplicate]
Do we accelerate with 9.8 m/s² when we are on the ground , if so why we do not fall inside the eart . How is the net force is zero , how many real forces acts on the body ?
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How can you use General Relativity to find the acceleration $9.81$ m$/$s$^2$ due to gravity? [duplicate]
Using the Schwarzschild metric and the mostly minus signature, how can I calculate the $9.81$ m$/$s$^2$ of acceleration on Earth using general relativity and the geodesic equation?
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Do particles in free fall also emit radiation? [duplicate]
Here is my question:
Accelerated particles emit radiation.
What about a particle that is in free fall, does it also emit radiation?
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What is the gravitational field of an accelerated particle?
Could we simply change coordinates of the Schwarzschild metric in order to obtain the metric of a moving massive particle? Which would those coordinates be? Rindler coordinates? Maybe there is a ...
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What kind of coordinate change is needed to make gravity disappear?
I understand that the Christoffel symbols associated with the metric will vanish locally once you perform the appropiate change of coordinates. These new coordinates correspond to an observer in free-...
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How is this approximation of gravity involving Rindler coordinates valid?
I have seen that it is possible to approximate the metric in the presence of a gravitational field by the Rindler metric:
Does a uniform gravitational field exist? Is there any acceleration in a ...
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Is the sensation of falling purely due to air resistance?
When I jump off of something, even with eyes closed I can be pretty certain that I'm falling due to the associated sensation of falling. However, as gravity should be affecting each of my internal ...
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As the speed time graph for a body thrown vertically upwards is not differentiable at the top point so why acc. is taken as 9.8 m/s² at the top point?
In the shown speed - time graph for a body thrown vertically up there is a sharp kink in the graph at the instant for which body is at highest position ie not differentiable so we can't find ...
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Earth surface acceleration and inertial geodesics
I hope this is an appropriate question for this forum. It is one I have struggled with for a while.
I read that in GR gravity is not a force, and that the apparent force we feel and can measure (eg ...
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Thrust vector placement for an object affected by gravity to reach a target direction vector
The problem occurred when I tried to calculate the thrust vector angle of a missile for it to fly into a certain direction. Without gravity this would be a really simple problem, but including gravity ...
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Is non-linear acceleration a necessary condition for an object to generate gravitational waves?
I was assuming every object that interferes with the gravitational field creates gravitational waves, and someone pointed out that only objects under acceleration do so. I searched through many sites ...
