Could be a disc brake rotor, pulley.
A merry-go-round rotates because it spins on an internal axis. But the child on the merry-go-round revolves about the axis
a sphere
It is a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).
Circular objects are shapes with a round outline, like wheels, plates, coins, and clocks. They have a consistent curvature around a central point, making them symmetrical in all directions.
pulleys
Winding or coiled round; curved into a circle; taking a circular course., To revolve round a central point; to move spirally about an axis, as a tornado; to revolve.
I guess you cannot. Even if the object is firmly nailed down, it is in motion because the Earth is in motion - rotating about its axis and revolving around the sun. And then the sun is whizzing through space, in its path around the galactic centre, and the Milky Way Galaxy is moving towards the Andromeda cluster, and ...The only thing that you can do is to select a point of reference , which you consider a fixed point of reference and, if the location of the object with respect to that fixed point changes, then it is in motion.
A wheel is a round device to roll a vehicle on. The wheel rotates around the axle which is fixed to the vehicle.
The pivot point of a lever, also known as the fulcrum, is the point around which the lever rotates or pivots when a force is applied to one end of the lever. It is the fixed point that allows the lever to amplify force or distance. The position of the fulcrum relative to the points where the force is applied and where the load is placed determines the mechanical advantage of the lever.
360 degrees ( all the way round the central point). However, for one given sector it is 360/12 = 30 degrees.
because to be more fixed.
Yes, as it is originally configured with a fixed 10 round magazine and a fixed stock.