Wednesday, September 25, 2013

If the sun is used as your frame of reference, why do you always have kinetic energy?

When the sun is used as the frame of reference, the Earth
is constantly moving around the Sun. And so is a body that lies on the Earth. Even a
body which may appear to be stationary on the Earth is moving around the
Sun.


The movement results in a kinetic energy that is given
by the relation KE = (1/2)*m*v^2, where m is the mass of the body and v is the velocity
of the body in the reference frame of the Sun.


To have a
zero kinetic energy in the frame of reference of the Sun, we would have to be still and
have the same location with respect to the Sun. This is not possible to do, as
attempting the same would result in our collapsing into the Sun due to the gravitational
force of attraction.

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