Isaac+Newton's+First+Law+of+Motion



A long time ago there was an ancient Greek philosopher named Aristotle. He was considered one of the smartest people in his time. However, he did not have ALL of the answers.

He believed that all objects had a natural place on Earth.

He believed that heavy objects (like rocks) wanted to rest on Earth,



that light objects wanted to be in the sky,



and that the stars wanted to stay in the heavens.

Much later there came a man named Isaac Newton.

Isaac Newton discovered that objects move because of something forces them too. This may seem like common knowledge but at the time this was a very new idea.

Has anyone ever played golf? What can you tell me about the game?

(the ball is at rest) How does the ball move?





(force impressed upon ball to make it move)

(call on student volunteer to how this works using a tennis ball. prop tennis ball up on a stand, show that tennis ball is not moving because there is no outside force causing it to move. knock tennis ball over to show an external force moving it.)

Where might we see an example of an object that needs force to make it move?











Now lets talk about our experiment....



A catapult is a device used to quickly launch an object over a great distance.



Although the catapult has been used since ancient times, it has proven to be one of the most effective mechanisms during warfare.



Catapults were invented by the ancient greeks.

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Things we need....





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