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How to Calculate Tidal Force

What is Tidal Force?

Tidal forces arise from gravity gradient: near side attracted more than far side, stretching objects. Governs Moon stability and planetary rings.

Step-by-Step Guide

  1. 1Input primary mass, satellite mass, separation distance
  2. 2Calculate tidal force gradient
  3. 3Compare to self-gravity

Worked Examples

Input
Earth-Moon system
Result
Tidal force sufficient to cause 1m ocean tides
Moon receding ~3.8 cm/year

Common Mistakes to Avoid

  • Confusing tidal force with mass effect
  • Neglecting density in Roche limit

Frequently Asked Questions

When does tidal force destroy objects?

When exceeds self-gravity: Roche limit. Depends on density, composition.

Ready to calculate? Try the free Tidal Force Calculator

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