D D Question 13 Card Hospital * Glass tumbler Coin Force acts on card only Question 14 *Ambulance Card moves away Coin falls into glass Which phenomena explains the placement of the coin at the bottom of the tumbler once the card is removed and why? A Inertia; because the card experiences force and the coin continues at rest. B Gravity; because as the card is moved, force will pull the coin to the bottom of the tumbler. C Friction; because the movement of the card will pull the coin to the bottom of the tumbler. Air resistance; because as the card is moved, the air resistance pushes the coin to the bottom of the tumbler.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”