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====== Q5. Toy Cars - Slope & Surface Friction: ======
Toy cars – An open-ended task requires students to relate the height of a toy car on a slope to the energy it will have at the bottom of a slope. They describe the forces acting on the toy car and explain its motion in terms of varying frictional forces on different surfaces.

=== CORE CONCEPTS: ===
Gravitational potential energy is the energy stored in an object as the result of its vertical position or height.
  - The higher that an object (a toy car) is elevated (higher on a slope), the greater the gravitational potential energy. a doubling of the height will result in a doubling of the gravitational potential energy (the car will roll twice as far).
  - The more mass that an object has (the heavier it is), the more inertia that an object has (the lazier it is),  A more massive object (a heavier object) has a greater tendency to resist changes in its state of motion. When accelerated via gravity, inertia and mass always cancel each other out!

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{{youtube>R7JMBqgl0Hc?640x360|Friction - Blades, Skis & Barefoot}}
**Video. Friction Fun -  Blades, skis and barefoot**

 * IF UNABLE TO ACCESS YOUTUBE VIDEO (requires Flash) TRY:[[http://viewpure.com/R7JMBqgl0Hc|Friction - Blades, Skis & Barefoot]]

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** Simulator/Interactive:**
Friction - the effect of running a car on different surfaces:

[[http://www.bbc.co.uk/schools/scienceclips/ages/8_9/friction_fs.shtml|{{:learn:forces:quiz:friction-action-lab-640x360.jpg|Friction simulator}}]]

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In the Barefoot waterskiing of the videos you watched for this question in the quiz, one of the boys mentioned that his feet "would start to burn".
  * How can it be that your feet could start to burn when they are in cold water?
  * If you were a water-skiier is there anything you can think of doing to make sure your feet did not burn?

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