Density and Buoyancy Stem Challenge
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Questions and Answers

What determines whether an object will float or sink in water?

  • The shape of the object
  • The size of the object
  • The density of the object compared to water (correct)
  • The color of the object

    • What is the purpose of gears in a machine?

  • To increase the speed of motion
  • To connect two rotating parts together (correct)
  • To decrease the force required for motion
  • To change the direction of motion

    • What would happen if you interlock a large gear with a small gear?

  • The large gear would turn faster
  • The small gear would turn faster (correct)
  • The large gear would turn in the opposite direction
  • The machine would stop working

    • What is needed to make the boats move across the water?

    <p>A sail to catch the wind</p> Signup and view all the answers

    What would happen if you place objects in the boat?

    <p>The boat would move slower</p> Signup and view all the answers

    What is the purpose of creating a double gate that opens from the left and right?

    <p>To allow both sides to be opened simultaneously</p> Signup and view all the answers

    Study Notes

    Density and Buoyancy

    • Density refers to how close together the molecules of an object are.
    • Objects less dense than water will float.
    • Objects more dense than water will sink.

    Sailing and Wind

    • To make boats move across the water, materials are needed to create sails.
    • The concept of "wind" needs to be replicated to test the sail's effectiveness.

    Gears and Mechanisms

    • Gears are rotating parts of a machine with teeth that can interlock with another gear.
    • When a large gear is interlocked with a small gear, the smaller gear turns faster.
    • When two gears of the same size are interlocked, they turn at the same speed.
    • Gears can be used to create mechanisms, such as a double gate that opens from both sides.

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    Description

    Parker, the park manager, needs help making boats move across the water. Learn about density and buoyancy to solve this stem challenge.

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