на plus Accusative means motion on.
на plus Prepositional means location on.
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English sometimes distinguishes motion ('to') vs. location ('at'), and sometimes doesn't: we use the same word 'on' with both motion ('Put it on the table') and with location ('It is lying on the table').
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Russian distinguishes the two meanings by using different cases: Положќ её на стћл (Accusative) as against Онђ лежќт на столљ (Prepositional). Adverbs also make this motion/location distinction:
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Кудђ тІ положќла кнќгу?
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Where did you put the book?
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Гдљ кнќга?
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Where's the book?
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