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Tides and Tidal Forces

Tides and Tidal Forces

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Tides and Tidal Forces. Near Satellites Orbit Faster. What If Satellites Are Tethered?. The Tension Is Real. There are Two Tidal Bulges on Earth. Both Moon and Sun Cause Tides. Tides on the Real Earth. Tidal Friction. Tides Affect Earth and Moon . Tides and the Earth-Moon System. - PowerPoint PPT Presentation

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Page 1: Tides and Tidal Forces

Tides and Tidal Forces

Page 2: Tides and Tidal Forces

Near Satellites Orbit Faster

Page 3: Tides and Tidal Forces

What If Satellites Are Tethered?

Page 4: Tides and Tidal Forces

The Tension Is Real

Page 5: Tides and Tidal Forces
Page 6: Tides and Tidal Forces

There are Two

Tidal Bulges

on Earth

Page 7: Tides and Tidal Forces

Both Moon and Sun Cause Tides

Page 8: Tides and Tidal Forces

Tides on the Real Earth

Page 9: Tides and Tidal Forces

Tidal Friction

Page 10: Tides and Tidal Forces

Tides Affect Earth and

Moon

Page 11: Tides and Tidal Forces

Tides and the Earth-Moon System• Moon retreating at 4 cm/yr• Day currently lengthening by 2 sec/100,000 yr• Fossil organisms and some rocks preserve

tidal records• 600 million years ago– Day was 22 hours long– 400 days/year– Moon 13,000 km closer– Rate of change not constant

Page 12: Tides and Tidal Forces

Tides and Planets• All satellites are locked to their parent planets• Large tides can heat planetary interiors• Tidal forces change orbital eccentricity• Most satellites– Planet rotation slows– Moon moves outward– Can “leak” away (Deimos)

• Retrograde Satellites– Satellite moves inward (Triton)