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The Invisible Force of Gravity

The Invisible Force of Gravity. By Emily Weil 9/10/09. Science Standard 3- The Physical Setting. Indicator 5.3.6- Demonstrate that things on or near Earth are pulled towards it by Earth’s gravity. Taken from: http://www.indianastandards.org/standardSummary.asp?Subject=sci&Grade=5 .

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The Invisible Force of Gravity

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  1. The Invisible Force of Gravity By Emily Weil 9/10/09

  2. Science Standard 3- The Physical Setting • Indicator 5.3.6- Demonstrate that things on or near Earth are pulled towards it by Earth’s gravity. • Taken from: http://www.indianastandards.org/standardSummary.asp?Subject=sci&Grade=5. • Link to Activity: http://www.indianastandards.org/files/sci/sci_5_3_pull.pdf.

  3. Definitions • Gravity- Force of attraction that causes objects on Earth to fall towards the center (or downward). • Force- Push or Pull on an Object. • Balancing Point (Center of Gravity)- Point of an object that is closest to the ground (where weight equal on all sides). • Mass- Amount of matter in an object.

  4. Testing Gravity • The mass of an object determines its gravity. • Weight has a direct relationship with gravity (mass is not the same thing as weight) • An object of the same mass can have different weights when there are different gravities • Gravity can vary from place to place (the moon and other planets all have different gravities). • Your weight (you keep the same mass) is different on Earth than it is on the moon.

  5. Try it out! • Look at the given chart and equations: • Pluto- weight/7.5 • Mercury- weight/2.9 • Mars- weight/2.63 • Calculate your weight using the equations. • What happens? Is your weight greater with greater force of gravity? • Now let’s test whether gravity affects the speed of descent. • Use to two objects (weight them) given and drop them from the same height • Do they fall at different speeds?

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