F=ma. F=0, a=0.
The object is either moving a constant velocity or not moving at all.
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If they are not coplanar, you would need at least four forces to get a net force (resultant force) of zero.
EF=0 means when the net force on something is 0 (zero).
Zero is.
As we know equipotential surface means there is no potential difference that is no work is done on surface.so lines of force must intersect surface at right angles to satisfy this statement,so that net work is zero.
The term "steady speed" indicates a constant velocity. This implies that there is no net acceleration, and thus no net force. Any net force on a moving object will cause a change in velocity, as per Newton's First and Second Laws.