BBC Learning Zone Clips

CLIP 17

Force, pressure and surface area - ballerina vs tank

Force, pressure and surface area - ballerina vs tank
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Key Info
  • Force, pressure and surface area - ballerina vs tank
  • Duration: 02:51
  • The relationship between pressure, force and contact area is demonstrated. A Scorpion tank exerts a downward force of 80,000N whereas a ballerina exerts only 600N. Which exerts the greatest pressure on the ground? The tank, with its large tracks and greater surface area, exerts a pressure on the ground which is seventeen times less than the ballerina on one point.
  • Subject:

    Science

       Topic:

    Phys: Forces - Contact and Non-contact

  • Keywords: force, pressure, surface area, contact area
Ideas for use in class
  • Use this clip as an example of a real-life situation where the pressure which an object exerts is designed to be less than assumed. Plenary to lesson on pressure to consolidate learning, G&T pupils could estimate the respective pressures of the tank and the ballerina.
Background details
  • Clip language : English
  • Aspect ratio : 4x3

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