2. Escape Velocity

4. Must travel about 8 km/s or 18,000 mi/hr Trouble is that at this speed the atmosphere heats up objects and burns them up Image from Yahoo images

5. What About A Satellite Some think that satellites are too far away to be effected by gravity – not true The high altitude is to put satellites outside the earths atmosphere – not gravity Image From Yahoo images

6. Escape Velocity

7. Forces in Orbit

10. Elliptical Orbit

13. Comets

14. Escape speed – speed at which an object shot vertical can escape earth 11.2 km/s = 25000 mi/hr sun 620 km/s moon 2.4 km/s mars 5.0 km/s