This trick demonstrates Newton's first law: a body is at rest or moves with constant velocity unless some force do not accelerate it or cause it to stop. In this trick, the coin is resting. The friction between the card and the coin is negligible. So when the coin is on the card, force of gravity pulling the coin downward is compensated by the force of card's elasticity acting on the coin upward.
When you flip the card, the force acting upward disappears, the force of gravity is still pulling the coin down, that is why it falls.
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Discuss the following terms, and their use of the principle of torque: (a) screwdriver (b) wrench (c) pliers (d) wheelbarrow (d) nutcracker (e ) crowbar
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