Free Fall DEMO: Crumbled Paper & Tennis Ball Tower of PISA.

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Presentation transcript:

Free Fall DEMO: Crumbled Paper & Tennis Ball Tower of PISA

Elephant & Feather Experiment Imagine that you release an elephant and a feather from the Tower of Pisa. Assuming that the air resistance is negligible, which object hits the ground first? Video: Do cats always fall on their feet? Discuss.

Acceleration Due to Gravity Every object on the earth experiences a common force: the force due to gravity. This force is always directed toward the center of the earth (downward). The acceleration due to gravity is relatively constant near the Earth’s surface. Earth Fg g

Acceleration Due to Gravity In a vacuum, all objects fall with same acceleration. Equations for constant acceleration apply as usual. Near the Earth’s surface: a = g = 9.81 m/s2 or 32 ft/s2 Directed downward (usually negative).

Accepted Value g=9.81 m/s2 The value of weight Fg=mg changes with latitude because Earth is not a perfect sphere

Gravity on the Other Planets