Question

Fill a glass with sand keep a piece of cardboard on it keep a 5 rupee coin on the cardboard now strike the cardboard hard using your fingers observe what happens

Answer 1

Explanation:

Dropping a penny into an empty glass sounds ordinary and simple… at first. At Steve Spangler Science “ordinary and simple” are invitations for us to dream up ways to use science to get it done. The challenge is to discover a creative and scientifically sound way to drop a penny into a glass. We tested a variety of ideas but realized that Sir Isaac Newton had it locked up for years in his First Law of Motion.

Answer 2

Explanation:

You find that whether the coin falls in the beaker or not depends on the length of the card and the force with which you flick. It also depends on the friction at the surfaces of contact.

As soon as the card begins to move it slips against the coin and exerts a forward force on the coin. By the time coin runs out of card’s surface below, the coin also moves a little in forward direction. The coin falls in the beaker only if this forward displacement is smaller than the radius of the beaker. Otherwise it falls outside the beaker. Thus in no case, the coin ``remains at its own place'' as the card moves out.