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Does it sound natural? Put a solid ball, which is for sports test, and a ping pong ball into water at the same time. After letting them go, you will find the solid ball sinks into the bottom of the water, and the ping pong ball floats to the surface. According to the picture shown below, compare the buoyancy forces of the solid ball and the ping pong ball when they are in the water. Which of the following statements is correct?(   ) A.The solid ball has a greater buoyancy force. B.The buoyancy force of the solid ball is as great as that of the ping pong ball. C.The ping pong ball has a greater buoyancy force. D. It is uncertain.
Jun 18, 2019 11:48 AM
Answers · 2
Some small changes. Assuming you want students to choose answer B, I emphasized that both balls are still underwater. Of course, after the ping pong ball rises to the surface, it will displace less water, and so will experience less buoyant force than the solid ball. You are performing product testing for a sports equipment manufacturer. You hold two balls underwater: a solid ball and a hollow ping pong ball with the same diameter. After you release them, the ping pong ball floats to the top, while the solid ball sinks to the bottom. Look at the picture below. When both balls are still underwater, which of the following statements is true? A: The solid ball is experiencing greater buoancy force. B: The buoyancy force on both balls is equal C: The ping pong ball is experiencing greater buoyancy force. D. Unknown: not enough information
June 18, 2019
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