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# TOC: Gravity 2/13/12 - PowerPoint PPT Presentation

TOC: Gravity 2/13/12. 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?.

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TOC: Gravity2/13/12

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

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.

III. with many calculations- he discovered that the same reason the apple hit his head was the reason we stay in orbit around the sun!!!! APPLication

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

Connection with many calculations- he discovered that the same reason the apple hit his head was the reason we stay in orbit around the sun!!!!

• 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?

IV. Exit: with many calculations- he discovered that the same reason the apple hit his head was the reason we stay in orbit around the sun!!!!

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