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"reference"
:p hi
deflection of moving objects when the motion is described relative to a rotating reference frame.
You have to use a reference point. Pick anything around the area (it's better if it's stationary), and then check to see if the other object changes position at all (in comparison to the reference point). If it does change position, then the object is in motion.
The first invention of Albert Einstein was the doctorate formula that accurately described the Brownian motion. The Brownian motion is used in Physics to explain the movement of particles in a given fluid.
A reference point
reference point
"reference"
That would be a reference point.
:p hi
A landmark - or reference point.
Motion it the change of an object over time relative to its reference point. that is called a reference point.
deflection of moving objects when the motion is described relative to a rotating reference frame.
the sun
Motion is always compared to a reference point. If you and some friends are driving in a car at 60 mph from your reference point your friends do not appear to be moving, but if you are standing at the side of the road as the car goes by the passengers will appear to be moving at 60 mph.
Something that is in motion changes position, the position of the object is described relative to another object. If you chose the tree as a reference point, then the object in the pictures has been in motion because it has changed postions relative to the tree.