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This is an interesting example. It has what is known as an implied subject. This sentence is an instruction which is addressed to you. If we were to write it out in full, it would say "You should flip the pancake when the edges are brown" (which, incidentally, is true). The subject of that sentence is you. Pancake is the object. And "when the edges are brown" is an adverbial phrase, which modifies the verb flip.
It's a spatula, a flat plate on the end of a stick, which you can slide under a pancake and flip it over.
She decided to flip the pancake to cook the other side.
Movement of a shape can involve flexing - for example, a square frame being flexed into a rhombus. Rigid motion excludes such motion: the shape of the moving object does not change.
dilation (APEX)
Stretch
The key difference between a particle and a rigid body is that a particle can undergo only translational motion whereas a rigid body can undergo both translational and rotational motion
Rigid motion
A rigid link is: a joint between Structural members which does not permit relative motion between them.
Planets
( t = I a ) Rotational motion and centripetal acceleration. This is defined by its equations of motion.
Edward Washington Suppiger has written: 'An analysis of the motion of a rigid body' -- subject(s): Dynamics, Rigid, Rigid Dynamics