1. PROJECTILES, SATELLITES AND GRAVITY Satellite and Circular Motion

2. Free Fall Motion http://www.youtube.com/watch ?v=nnwmK2Xa5FIhttp://www.youtube.com/watch ?v=nnwmK2Xa5FI 2.5 min on moon http://www.youtube.com/watch ?v=efzYblYVUFk http://www.youtube.com/watch ?v=7ciStUEZK-Yhttp://www.youtube.com/watch ?v=7ciStUEZK-Y falling on the moon http://www.youtube.com/watch?v=8V9q uPcNWZE Singing on the moon http://www.youtube.com/watch ?v=VIBgVnlXE5U Driving on the moon http://www.youtube.com/watch ?v=f-FxhCZold0 Golf ball on moon http://www.youtube.com/watch ?v=2V9h42yspbo Vomit comet http://www.youtube.com/watch ?v=gTqLQO3L4Ko Water balloon in vomit comet http://www.youtube.com/watch ?v=KFPvdNbftOY Washrag in space http://www.youtube.com/watch ?v=o6nhTeLO5yY Five senses: smell in space http://www.youtube.com/watch ?v=qHrBhgwq__Q Knitting needle electric force field

3. GRAVITY The force of attraction between any two objects with mass. A field force (a non-contact force) A universal force (Gravity is everywhere) The weakest of the 4 fundamental forces

4. In orbit around the Earth, Astronauts experience 90% of the gravitational force you experience at the Earth’s Surface

5. Gravitational Force Field

6. Einstein’s View of Gravity mass deforms the space-time fabric, Earth follows the contour (even light follows the contours of space-time)

7. Gravity Fg is the force of gravity and your weight All objects with mass are surrounded by a gravitational force field

8. Gravity Gravity depends upon the mass of the objects and the distance between them M1 M2 d More mass, more gravity M1 M2 d Increase distance, decrease gravity

9. Inverse-Square Law Changes in the intensity of gravity are caused by changes in the mass or in the distance between masses, and follow the inverse- square law. Electrical and magnetic fields, light, radiation, sound, gravity, and even spray paint. Systematic decrease in concentration or intensity due to spreading out. Intensity = 1 d 2

10. Law of Universal Gravitation Newton’s law of gravity Fg = m1 x m2x G d 2 G is the gravitational constant 6.673 x 10 -11 N x m 2 /kg 2 Can be used to calculate the gravitational force between any two objects

11. Universal Law of Gravitation Gravity depends upon --Mass --Distance between masses Differences in the intensity of gravity can be calculated using Newton’s Universal Law of Gravitation G is the gravitational constant G = 6.672 × 10 -11 m 3 /(kg sec 2 ). Measure distance from center of object. F = G m 1 m 2 d 2