How Do Objects Behave When Dropped from Satellites?

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SUMMARY

When an object is dropped from a satellite in Low Earth Orbit (LEO), it initially retains its orbital velocity but will ultimately fall towards Earth due to gravitational acceleration. The object does not continue to move along with the satellite because it is subject to the force of gravity, which causes it to descend. Additionally, geostationary satellites are in free fall, maintaining a constant speed rather than a constant velocity, as their direction changes continuously while orbiting the Earth.

PREREQUISITES
  • Understanding of gravitational acceleration and its effects on falling objects
  • Knowledge of orbital mechanics, specifically Low Earth Orbit (LEO) dynamics
  • Familiarity with the concept of geostationary satellites and their motion
  • Basic principles of physics related to velocity and speed
NEXT STEPS
  • Research the effects of atmospheric drag on Low Earth Orbit satellites
  • Study the principles of orbital mechanics and how they apply to satellite motion
  • Learn about the differences between speed and velocity in physics
  • Explore the concept of free fall and its implications for objects in orbit
USEFUL FOR

Students of physics, aerospace engineers, and anyone interested in the dynamics of satellite motion and gravitational effects on falling objects.

Amith2006
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Sir,
1)If an object is dropped from a satellite moving close to the Earth will it fall to the Earth or will it move along with the satellite? The answer given in my book is, it will fall to the Earth with an acceleration due to gravity. But how is it so? At the instant it is dropped, it has an orbital velocity. So it should move along with the satellite, isn’t it Sir?
2)It is said that the geostationary satellite is falling freely under gravity while orbiting the earth, then how does it have a constant orbital velocity?
 
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Amith2006 said:
Sir,
1)If an object is dropped from a satellite moving close to the Earth will it fall to the Earth or will it move along with the satellite? The answer given in my book is, it will fall to the Earth with an acceleration due to gravity. But how is it so? At the instant it is dropped, it has an orbital velocity. So it should move along with the satellite, isn’t it Sir?
This is a guess, but perhaps the key in in the words "close to earth". A satellite in a Low Earth Orbit usually is orbiting in the Exosphere, where there is some tiny amount of air resistance. If the satellite does not use its rockets to provide periodic boosts, it will gradually lose speed and spiral earthwards.

2)It is said that the geostationary satellite is falling freely under gravity while orbiting the earth, then how does it have a constant orbital velocity?
It does not have a constant velocity - only a constant speed.
 

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