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Work and Energy — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceWork and Energy3 Marks
Question
Work done on an artificial satellite by gravity is zero while moving around the earth.
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Answer

  • When the artificial satellite moves around the earth in a circular orbit, gravitation force acts on it.
  • The gravitational force acting on the satellite and its displacement are perpendicular to each other. i.e. 0 = 90°
  • For 0 = 90°, work done is zero. [ v cos 90 = 0)
  • Hence, work done on an artificial satellite by gravity is zero while moving around the earth.

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