P3 1.8 SATELLITES

Learning objectives

Be able to explain:

• the period of an orbit• a geostationary orbit

P3 1.8 SATELLITES

Imagine launching a satellite from a very tall mountain:

P3 1.8 SATELLITES

Imagine launching a satellite from a very tall mountain:

P3 1.8 SATELLITES

Imagine launching a satellite from a very tall mountain:

Moving in circles needs:1. high sideways speed 2. central force

P3 1.8 SATELLITES

Imagine launching a satellite from a very tall mountain:

Moving in circles needs:1. high sideways speed 2. central force

The period of an orbit is the time taken to make one complete orbit.

P3 1.8 SATELLITES

P3 1.8 SATELLITES

Natural satellites of the sun: Planets “ “ “ “ earth: Moon

Artificial satellites of the earth:* All have no interference from the atmosphere & clouds

P3 1.8 SATELLITES

Natural satellites of the sun: Planets “ “ “ “ earth: Moon

Artificial satellites of the earth:* All have no interference from the atmosphere & clouds 1. Observational satellites - equipped with telescopes to study planets , stars galaxies, outer space

P3 1.8 SATELLITES

Natural satellites of the sun: Planets “ “ “ “ earth: Moon

Artificial satellites of the earth:* All have no interference from the atmosphere & clouds 1. Observational satellites - equipped with telescopes to study planets , stars galaxies, outer space

2. Geostationary Communications satellites - link different countries with TV, radio telephone

Orbit time =

P3 1.8 SATELLITES

Natural satellites of the sun: Planets “ “ “ “ earth: Moon

Artificial satellites of the earth:* All have no interference from the atmosphere & clouds 1. Observational satellites - equipped with telescopes to study planets , stars galaxies, outer space

2. Geostationary Communications satellites - link different countries with TV, radio telephone

Orbit time = 24hrs ,

Satellite stays exactlyin the same place when viewed from earth at 36,000kmabove the equator.

P3 1.8 SATELLITES

3. Polar monitoring satellite* has a low polar orbit, the whole earth is scanned as it spins below.

Orbit time: 75 minsUse: weather monitoring

P3 1.8 SATELLITES

P3 1.8 SATELLITES

P3 1.8 SATELLITES