2. Analyse the forces involved in uniform circular motion for a range of objects, including satellites orbiting the Earth Solve problems and analyse information to calculate centripetal force acting on a satellite undergoing uniform circular motion about the Earth using F= mv 2 /r

3. Compare qualitatively low Earth and geo-stationary orbits Other Advantages: 1. Remote sensing of the Earth’s weather, oceans, pollution, ozone etc. need low orbits to increase resolution and sensitivity. 2.Spy satellites often need to get as close as possible. 3.Geopositioning needs high accuracy and hence low satellite orbit to reduce errors. 4.It costs more to place objects at high altitudes.

4. Kepler’s 3rd Law p. 294-296 Yr 11 Jacaranda text Solve problems and analyse information using: r 3 /T 2 = GM/4  2 Jacaranda p.48; p.59,q.6

5. Account for the orbital decay of satellites in low Earth orbit There may be unpredicted drag due to solar winds producing unexpected heating and expansion of the atmosphere