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Tides and Tidal Forces

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.

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Tides and Tidal Forces

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  1. Tides and Tidal Forces

  2. Near Satellites Orbit Faster

  3. What If Satellites Are Tethered?

  4. The Tension Is Real

  5. There are Two Tidal Bulges on Earth

  6. Both Moon and Sun Cause Tides

  7. Tides on the Real Earth

  8. Tidal Friction

  9. Tides Affect Earth and Moon

  10. 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

  11. 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)

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