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====== Q8. Falling Down A Hole Through The Earth: ======
The Earth: The purpose of this task is to consider the shape of the Earth, where we live on it and of objects falling down towards the Earth.

=== CORE CONCEPTS: ===
On Earth, objects do not just fall 'down', they fall towards the centre of the Earth. Gravity is a property shared by all objects - including a beam of light.

Everyone knows the phrase 'What goes up must come down', but the goal of a good educator is to explain phenomenon in terms of principles that go beyond a single phenomenon - instead, to provide an understanding that is capable of generalisation in a deep and consistent manner.

A student's conception of gravity must grow in sophistication to the point that it becomes more than a mere name associated with 'falling'. Gravity must be understood in terms of its cause, its source, and its far-reaching implications on the structure and the motion of the objects in the universe.

++++ Q8. CLICK HERE TO SEE / HIDE STUDENT FLIP RESOURCES:|
{{youtube>jN-FfJKgis8?640x360|What if the Earth was hollow}}

** Video: What would happen if you fell through a hole in the Earth? **
  * IF UNABLE TO ACCESS YOUTUBE VIDEO (requires Flash) TRY:[[http://viewpure.com/jN-FfJKgis8|What if the Earth was hollow]]

{{youtube>NOHBDiR5urE?640x360|Neil Degrasse Tyson - NOVA Short Journey Through the Center of the Earth}}

**Video: Neil Degrasse Tyson - NOVA Short Journey Through the Center of the Earth**
  * IF UNABLE TO ACCESS YOUTUBE VIDEO (requires Flash) TRY:[[http://viewpure.com/NOHBDiR5urE|Journey Through the Centre of the Earth]]
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{{:learn:forces:quiz:what_if_the_earth_were_hollow.mp4|What if the Earth was hollow}}
{{ :learn:forces:quiz:nova-journey-through-center-of-earth.mp4|Neil Degrasse Tyson Journey Through The Centre Of The Earth}}

** Video: Click to view if the youtube video link(s) (above) not working **


** Simulator/Interactives:**

This Sky-Diving Interactive allows the learner to explore the motion of an object falling under the influence of air resistance. Force arrows and values are shown as the object falls. A speedometer displays the speed of the object; the height is listed as well. The mass of the falling object and the size of its parachute can be varied. Enjoy the Skydiving Interactive without the fear of falling.
  * Simulation/Interactive: [[http://www.physicsclassroom.com//PhysicsClassroom/media/interactive/Skydiving/index.html|Sky Diving Interactive]]
  * Video: [[http://www.youtube.com/watch?v=NOHBDiR5urE|Falling through the Earth]]
  * IF UNABLE TO ACCESS YOUTUBE VIDEO (requires Flash) TRY:[[http://viewpure.com/NOHBDiR5urE|Falling through the Earth]]
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++++ Q8.  CLICK HERE TO SEE / HIDE EXTRA STUDENT FLIP RESOURCES|
[[:learn:forces:learn:gravity-current:home|ALL ABOUT GRAVITY]]

FIXME - Work in progress - June 2015

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