Sensation is the pickup of information by our sensory receptors, for example the eyes, ears, skin, nostrils, and tongue. While Perception is the interpretation of what is sensed.
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Absolutely. Perception isn't always reality -- as seen in phenomena such as optical illusions and sensory adaptation.
Natural Recources (thats all i know)
mass, centre of gravity, material smoothness of surface trying to create friction on, wet or dry surface.