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Sails and Wind Turbines

Moving air pushes hard on anything in its way. Sails catch that push to move a boat, and turbine blades turn it into electricity.

In the picture

  1. A taut sail: moving air pressing on cloth and pulling the boat forward
  2. A turning turbine blade: air pushing the blade around in a circle
  3. The generator housing at the top of the tower: the part the blades turn
  4. Leaning grass on the headland: air flowing past and bending thin stems

Examples

  • A kite lifting on a windy day
  • A pinwheel spinning in a breeze

Quiz: Sails and Wind Turbines (Age 11)

  1. What makes a sailboat move forward?

    • Water pulling on the sail
    • Moving air pushing on the sail
    • An engine turning the sail
  2. In a wind turbine, what do the turning blades make?

    • A tower bend like grass
    • A generator produce electricity
    • A sail catch the wind
  3. Which sentence best describes the main idea?

    • Moving air can push sails and turn turbine blades to do useful work
    • Moving air is made by sails and generators
    • Moving air only bends grass and cannot move boats or make electricity

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.

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Technology, Age 11