Do now! Is there anything to complete in your books?. Can you make a note that we will be having a “ Space and Gravity ” TEST on Thursday 24 th September.

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Presentation transcript:

Do now! Is there anything to complete in your books?. Can you make a note that we will be having a “ Space and Gravity ” TEST on Thursday 24 th September.

Satellites

How far could you kick a dog? From a table, medium kick.

How far can you kick a dog? Gravity

Harder kick?

Harder kick Gravity

Small cannon? Woof! (help)

Small cannon Gravity Woof! (help)

Bigger cannon?

Bigger cannon Gravity

Even bigger cannon?

Even bigger cannon Gravity

VERY big cannon?

VERY big cannon Gravity

Humungous cannon?

Dog in orbit! The dog is now in orbit! (assuming no air resistance of course)

Dog in orbit! The dog is falling towards the earth, but never gets there!

Dogs in orbit! The force that keeps an object moving in a circle is called the centripetal force (here provided by gravity) Gravity

Other examples Earth ’ s gravitational attraction on moon

Uniform circular motion The centripetal acceleration/force is always directed towards the centre of the circle Centripetal force/acceleration velocity

Note! There is no such thing as centrifugal force! (at least not until you get to university!) CENTRIFUGAL

Types of orbits

Geostationary The satellite orbits once every 24 hours, so appears to stay above the same point on the earth ’ s surface Looking from above the North pole

Geostationary Useful for communications satellites. Also for weather over one area.

Polar Satellite orbits over the poles

Polar Useful for mapping and remote sensing when the whole of the earth ’ s surface needs to be studied

Some famous satellites

Sputnik (4 th October 1957)

Russian 84 kg, 58cm diameter 800km above the earth km/h Orbited every 90 mins Fell after 92 days

Sputnik 2 (a month later)

450 kg Carried a dog! (Laika) Laika is believed to have died from overheating in the cabin a few hours after launch It ’ s a dogs life.

Hubble Space telescope

Launched in m long Doesn ’ t have to see through the earth ’ s atmosphere

That ’ s it!

Can you try some questions now? Page 141 in your book. Answer in full sentences please. TEST next Thursday 24 th September. Mr Porter is giving you a summary sheet to stick in.