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Question
Is a force required to keep a body moving
Is a force required to keep a body moving
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Solution
No forces are required to keep a body moving with a constant speed on a frictionless surface.
Consider an isolated area in space, where there is nothing around but vaccum, and no influence of stars or planets.
In such a place if you apply a force to a body, it will move in the direction of the force as long as no other external forces act on it.
Similarly, if you assume an infinitely long room with a friction-free floor,and you roll a ball along it, it would roll continuously, unless it is encountered by an external force.
This is actually Newton's First Law of Motion.
However, a centripetal force is required to keep a body moving in a circular path.
Consider an isolated area in space, where there is nothing around but vaccum, and no influence of stars or planets.
In such a place if you apply a force to a body, it will move in the direction of the force as long as no other external forces act on it.
Similarly, if you assume an infinitely long room with a friction-free floor,and you roll a ball along it, it would roll continuously, unless it is encountered by an external force.
This is actually Newton's First Law of Motion.
However, a centripetal force is required to keep a body moving in a circular path.
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