The notion of “fictitious force” comes up in Einstein’s general theory of relativity. All fictitious forces are
proportional to the mass of the object
upon which they act, which is also true for gravity. … This idea underlies Einstein’s theory of general relativity.
Why gravity is a fictitious force?
In general relativity, gravity appears as a fictitious force; this is
because GR attributes the apparent acceleration of gravity to the curvature of spacetime
. … You don’t “feel” gravity in an inertial reference frame (e.g. when the elevator cable snapped) because in that frame there’s no force acting on you.
Is gravity a fictitious force Reddit?
Note that it’s the description of gravity as a force (and not as curvature) that is fictitious — not gravity itself, nor the effects of gravity.
Gravity certainly exists
!
What are fake forces?
A fake force is
one of those forces that introductory texts tell you aren’t real – like centrifugal force
. They aren’t real in the sense that they are due to one of the fundamental interactions. … Just to be clear, a faux force is needed to use normal newtonian mechanics when the reference frame is accelerating.
Is gravitational force fictitious?
General relativity is his theory of gravity, and gravity is certainly the paradigmatic example of a “real” force. The cornerstone of Einstein’s theory, however, is the proposition that
gravity is itself a fictitious force
(or, rather, that it is indistinguishable from a fictitious force).
Are all forces fictitious?
The notion of “fictitious force” comes up in Einstein’s general theory of relativity.
All fictitious forces are proportional to the mass of the object upon which they act
, which is also true for gravity. This led Albert Einstein to wonder whether gravity was a fictitious force as well.
Why is it called a fictitious force?
When an object undergoes rotation, from the object’s reference frame, which is a non-inertial reference frame, the object feels there is a radially outward force, a centrifugal force, acting on it. However,
from an inertial reference frame, this force doesn’t exist at all
. That’s why it is called a fictitious force.
Is normal force a fictitious force?
When the observer is on the ground, he is not moving, and neither is his reference frame. So
there is no fictitious force
. You are correct that the normal force cancels the gravitational one in all reference frames.
Is gravity just mass?
Earth’s gravity comes from all its mass
. All its mass makes a combined gravitational pull on all the mass in your body. That’s what gives you weight. And if you were on a planet with less mass than Earth, you would weigh less than you do here.
Is inertia a fictitious force?
Inertial force, also called Fictitious Force,
any force invoked by an observer
to maintain the validity of Isaac Newton’s second law of motion in a reference frame that is rotating or otherwise accelerating at a constant rate.
Why is gravity not a force Reddit?
It’s not a force
because at some point it stops making sense to talk about forces
. Same thing with, say, the weak force.
Which is the real force?
“A real force is
a force which acts on an object due to another object
. An isolated object(far from all objects doesn’t experience any real force.”
Is centripetal force real?
With this definition, centripetal force
would be real and centrifugal not real
. Centripetal force is the force needed to make something move in a circle. … A constant magnitude centripetal force that is always perpendicular to the direction of motion will make the object move in a circle.
Why is centrifugal force fake?
Centrifugal force is an outward force
apparent
in a rotating reference frame. It does not exist when a system is described relative to an inertial frame of reference. … When this choice is made, fictitious forces, including the centrifugal force, arise.
Is Earth inertial or non inertial?
A coordinate system attached to the Earth is
not an inertial reference frame
because the Earth rotates and is accelerated with respect to the Sun.
Which of the following is called a fictitious force?
centrifugal force
is called fictitious force.
