Sat July 30, 2011 By: Pratibha Kamath

does inertia apply when a body moves on a curved surface?

Expert Reply
Mon August 01, 2011
Inertia applies to bodies which are in a state of rest or of uniform motion along a straight line. It is the inability of such bodies to change their state by themselves.
However, when a body moves on a curved surface, it is not moving uniformly along a straight line as its direction of motion changes at each point which gives it a non-uniform motion. An external force is required to move a body along a curved surface.
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