Force and Enegy...tuk klas delapan.

Observe moving things around you : the waving leaves, the traffic, or a running boy. How can they move? What makes them move? You will get the answers to these questions after studying force and energy. To get the answers, you need to investigate the important relations between motion and force.

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Finding out the relations between motion and force
1. Use a plastic cup filled with water or sand. Place a paper car on top of the glass.
2. Place a coin on the card, right in the middle.
3. Snap your fingers at the card horizontally. What happens?
4. Crumple a piece of paper approximately to the size of a marble. Place the crumpled paper on top of the card, and snap your fingers at the card horizontally. Write down
your observation.


For Your Journal
In your journal, describe what happened to the coin and the crumpled paper.
Explain why the coin and the crumpled paper moved as what you observed.
(Source : Student book Grade VIII chapter 5)