planets...

why the earth has an elliptical orbit?

2 Answers

6
AKHIL ·

There is no tangential acceleration (at least, not in the simple two body problem of Newtonian mechanics). No tangential acceleration is needed.

Central force motion (systems in which force is a function of distance to the origin only) does not mean the body subject to the central force is constrained to move in a circle. When the force is proportional to 1/r^2, the body is constrained to move along a conic section (circle, ellipse, parabola, or hyperbola).

39
Dr.House ·

see this

http://www.physicsforums.com/showthread.php?t=164387

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