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TOC: Gravity 2/13/12

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Starter

- This weekend I took a trip - I traveled 120miles for 2 hours. What was my average speed?
- This weekend I am going on another trip. This Time I am traveling 180 miles, If I go at the same speed as in question number 1, how long will it take me to get there?

- Write all notes in Practice Section

Gravity

- Gravity - The Force of Attraction between two objects

The Force that causes things to fall down

Example: if a pencil falls off a desk, it will land on the floor, not the ceiling

- Gravity pulls objects to Earth at a Speed of 9.8m/s (only changes with air resistance)
- Will a baseball and a soccer ball fall at the same rate? Will they hit the floor at the same time?

- Air resistance - the opposition of the atmosphere to forward movement; also called aerodynamic drag
- Centrifugal force - an outward force on a body rotating about an axis, assumed equal and opposite.

- Isaac Newton studied the earlier Scientists ideas that everything revolved around the sun

- Newton discovered WHY all planets stay around the sun – with many calculations- he discovered that the same reason the apple hit his head was the reason we stay in orbit around the sun!!!!
- This reason was GRAVITY!!!!!!

Draw and Describe each of the Demo’s - Answer each of the questions in at least 2 descriptive sentences each.

Demo 1: Gravity - Text Book & Balled up Piece of Paper

Demo 2: Gravity- Balled Up Piece of Paper & Flat Piece of Paper

Demo3: Centrifugal Force (Gravity in orbit) - Ball on a String

- In Demo 1 & 2, did the objects fall at the same rate? Yes or No. If no, explain.
- In Demo 1 & 2, What forces do you think caused them to fall at different rates (if they did)?
- In Demo 3, explain how this demo is a model of the sun and the Earth (or any other planet) in orbit.
- In Demo 3, Explain how the string acts as the force of gravity.
- In Demo 3, Explain what happened as the force of gravity went away? What direction did the ball (planet) go?

- Summarize in 7 sentences what you learned about gravity. Explain how the demos demonstrated Gravity. Be Descriptive!!!!!