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Motion energy
Objects have different mass because they not weighted the same..
Different objects may have different temperatures
Objects move on different surfaces by friction.
Objects have different mass because they not weighted the same..
Motion energy
all of these
Renaissance Naturalism
Bulls react to erratic movements of objects, not their color.
The different movements of animals are: - Walk - Run - Jump - Crawl - Swim - Fly
Kinetic depth cues
spectrometer
Objects have different mass because they not weighted the same..
Objects move on different surfaces by friction.
Different objects may have different temperatures
I would suppose it is referencing and mimicking the movements of a scale/balance which moves its own arms when the mass is being taken; lighter objects would be higher and heavier objects lower, movements which can be gestured using one's own hands.
gravity!