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Why does the gravitational potential ene...

Why does the gravitational potential energy U(r) is always negative?

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Becasue two masses come together slowly from infinity, work is done by the system.
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SURA PUBLICATION-GRAVITATION-VERY SHORT ANSWER QUESTIONS: (2 Marks)
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  2. Explain why high & low tide are formed on seas.

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  3. A satellite does not need any fuel to aide around the earth. Why?

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  4. By which law is the Kepler's law of areas identical? Is this Kepler's ...

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  5. Tides arise in the ocean. Give reason.

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  6. Assume that the law of gravitiontion changes from inverse square to in...

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  7. Out of aphelion and perihelion where is the speed of the earth more an...

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  8. If the K.E. of a satellite revolving around the earth in any orbit is ...

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  9. Does the change in gravitational potential energy of a body between to...

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  10. A comet orbits the sun is highly elliptical orbit. Does a comet has a ...

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  11. A comet orbits the sun is highly elliptical orbit. Does a comet has a ...

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  12. A comet orbits the sun is highly elliptical orbit. Does a comet has a ...

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  13. State the theory of geocentric model of solar system? And by whom thi...

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  14. State the theory proposed by Copernicus?

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  15. What did Galileo discover regarding gravitation?

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  16. What does the law of period of Kepler's law imply?

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  17. The gravitational force is always attractive in nature. Why?

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  18. Why does the gravitational potential energy U(r) is always negative?

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  19. What is 'retrograde motion' of planets?

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  20. Find the distance between Venus and Sun.

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