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====== Q4. Toy Cars - Slope, Weight & Energy: ======
Toy cars - An open-ended task requires students to relate the **height and weight** 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 forces.

=== 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!

To investigate this, see if a heavy car travels further than a lighter car down a slope?

++++ Q4. CLICK HERE TO SEE / HIDE STUDENT FLIP RESOURCES:|
{{youtube>bjm11VlUdX8?640x360|Frictional forces on different surfaces}}
**Video: Frictional forces on different surfaces **

{{:learn:forces:quiz:physics_toy_car.mp4|Frictional forces on different surfaces}}

**Video: Click above video to view if in school or if the above link not working**

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**Simulator/Interactives:**

[[http://www.bbc.co.uk/schools/scienceclips/ages/10_11/forces_action_fs.shtml|{{:learn:forces:quiz:forces-action-lab-640x360.jpg|See how far the car travels when you change the slope}}]]

Experiment to find out far the car travels when you change the slope and/or weight?

**HELP:** Click on blue left/right arrows at top of lab screen. Use mouse to change slope (gradient) and drag weights into back of car to experiment. Optionally store your data by clicking on 'table'.

Investigate how far the car travels when you change the weight:
  * [[http://www.bbc.co.uk/schools/scienceclips/ages/10_11/forces_action_fs.shtml|Interactive Simulator]]

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{{youtube>E43-CfukEgs?640x360|Weight & Acceleration}}
**Video: Weight & Acceleration in a vacuum**
 * IF UNABLE TO ACCESS YOUTUBE VIDEO (requires Flash) TRY:[[http://viewpure.com/E43-CfukEgs|Weight & Acceleration]]

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++++ Q4. CLICK HERE TO SEE / HIDE EXTRA STUDENT FLIP RESOURCES|
A Riddle: Heavy things are lazier than light-weight things, and that's one reason that small things can get even!

{{youtube>PZtXvxxCa3Q?640x360|Inertia, Mass & Movement}}

**Video: Inertia, Mass & Movement**
 * IF UNABLE TO ACCESS YOUTUBE VIDEO (requires Flash) TRY:[[http://viewpure.com/PZtXvxxCa3Q|Inertia, Mass & Movement]]

In the video, remember it said that big things are lazier (have more inertia), compared with small things (have relatively less inertia).

The thing to remember is that in science, the more mass an object has, the lazier it is, or more inertia it has. 

  * Set up an experiment where you roll two items of different weight down a slope. Roll each item at least ten times and record the distance each of them travel. How far does the heavy object roll compared with the lighter object. The cover of a book makes a good ramp. A small marble and a large marble would be good objects to roll.

  * Sally and and Josh have a disagreement. Sally says that if she throws a ball with a greater speed it will have a greater inertia. Josh says that inertia does not depend upon speed, but it does depend on mass. Who do you agree with? Explain why. The answer is in the DISCOVER section of this wiki - if you can find it!

  * Tell us about your experiment and your findings.

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**[[:learn:forces:discover:q04:home|CLICK HERE & SEE MORE DISCOVERY ACTIVITIES ABOUT THIS QUESTION]]**