BBC Learning Zone Clips

CLIP 13432

Could I survive an asteroid strike?

Could I survive an asteroid strike?
Play
Key Info
  • Could I survive an asteroid strike?
  • Duration: 05:28
  • Presenter Greg Foot investigates what would happen if an asteroid collided with Earth. He calculates how much energy would be transferred at impact using the formula E = ½mv2 and produces an equivalent explosion to show the size of crater produced by a meteoroid the size of a golf ball. He explains why the size and speed of asteroids matters and how our atmosphere protects from all but the largest asteroids. Greg does this by showing how air pressure alone can be used to ignite cotton wool and how air and friction cause objects smaller than 35m in diameter to burn up as they enter the Earth’s atmosphere before reaching the Earth’s surface. Unlike the Earth, the Moon has no atmosphere and this is why the Moon has a history of more numerous impacts. First broadcast on BBC Learning Zone and BBC3 in March 2012 as part of the series The Secrets of Everything.
  • Subject:

    Science

       Topic:

    Phys: Forces - Contact and Non-contact

  • Keywords: Earth, Moon, asteroids, meteoroids, potential energy, Near Earth Object, impact, explosion, crater, mass, velocity, atmosphere, friction, degrees Celcius, TheSecretsofEverything
Ideas for use in class
  • Students can perform simple experiments using ball bearings and a tray of sand to investigate the effect of speed and angle of impact on crater formation. This introduces the idea and use of E = ½mv2 to investigate the energy of different impacts. This can then be linked to everyday examples of collisions such as car crashes and calculations of the energy transferred at impact. Cross curricular links – Geology, Geography and Astronomy, concerning the history of the Earth. Contains examples of ‘How Science Works’.
Background details
  • Clip language : English
  • Aspect ratio : 16x9

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.