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07/01/2021 12:21 pm
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Set a five-rupees coin on a stiff card covering an empty glass tumbler standing on a table as shown in the figure.
Give the card a sharp horizontal flick with a finger. If we do it fast then the card shoots away, allowing the coin to fall vertically into the glass tumbler due to its inertia.
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07/01/2021 12:22 pm
The force applied on the card due to flicking changes the inertia of the card but the coin resist a change and stay at the rest i.e. inertia of rest and due to gravity falls down in the tumbler.