Why doesn’t gravitational force change the speed of a satellite in circular orbit?
To Explain: The gravitational force does not change the speed of satellite in the orbit.
Explanation of Solution
Introduction:
Work done is given as
Where,
W is the work done, F is the force, d is the displacement and
The motion of the satellite is circular and the gravitational force act on the satellite along the radius of the circular orbit towards the center. So, the angle between the gravitational force and the direction of motion of the satellite is always
The work done on the satellite by the gravitational force is zero because the value of
Conclusion:
Speed of satellite does not increase because work done by gravitational force on the satellite is zero.
Chapter 14 Solutions
Conceptual Physics: The High School Physics Program
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