Gravitational Force: What Keeps Two Bodies From Colliding?

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SUMMARY

The gravitational force between two celestial bodies, such as the Earth and the Sun, creates an attraction that is countered by the centripetal acceleration required for circular motion. This centripetal force allows the Earth to maintain a stable orbit without colliding with the Sun. The initial velocity of the Earth, which is perpendicular to the gravitational pull, ensures that while the Earth is constantly accelerated towards the Sun, its speed remains constant, resulting in a circular orbit.

PREREQUISITES
  • Understanding of gravitational force and its effects
  • Knowledge of centripetal acceleration and its role in circular motion
  • Familiarity with Newton's laws of motion
  • Basic concepts of orbital mechanics
NEXT STEPS
  • Study Newton's Law of Universal Gravitation
  • Learn about the principles of centripetal force in circular motion
  • Explore the concept of orbital dynamics and stability
  • Investigate the effects of initial velocity on orbital paths
USEFUL FOR

Astronomy enthusiasts, physics students, and anyone interested in understanding the mechanics of celestial orbits and gravitational interactions.

RAHIL008
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If two heavenly bodies are attracted towards each other by gravitational pull,
then what stops them from colliding, as in Earth is attracted by sun's pull.
 
Astronomy news on Phys.org
If you travel along a circle with a uniform speed, you must have an acceleration towards the center of the circle (centripetal acceleration). Every acceleration is caused by a force. So, if the force was exerted by the Sun to the Earth and the initial velocity of the Earth was perpendicular to their connecting line, then the Earth might revolve around the Sun in a circle. Even though it is accelerated, its speed does not change by magnitude and it always stays the same distance from the Sun.
 

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