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These are PowerPoints and sheets used in lessons about gravitational pull; centriputal force; and eliptical orbits. Most lessons start with a "Do now" that students do as they enter. I should mention that there are running jokes about my dislike of dogs (sorry!). See more at www.mrsimonporter.wikispaces.com
Although, as Mr Porter states, you will need to edit some of the slides I think this is a great/outstanding resource. The slide sequence that puts the kicked dog ( yes! ) into freefall is very good and will develop the concept as you explain it. Some good animated images to demonstrate geo-stationary and polar orbiting satellites are included at the end and I think this whole powerpoint covers the topic in a really accessible and pragmatic manner.
Step/through, very easy to understand, will take out the centrapetal bit though! Thanks!