Friction

First experiment

  • Try spinning a smooth rubber ball in a bowl of water. What happens?
  • Try the same with the tennis ball. What happens to it? Why?

Second experiment:

  • Place two things on a cutting board in wood, for example a button and a eraser. Tilt the board a little.
    What happened? Which object travels fastest? Why?
    Try other things too.
  • Repeat the same experiment with a metal or glass tray.
    What happens? Why?
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