EXAMPLE 3: THE WORKENERGY RELATION

A
particle moves under the constant horizontal force _{} and gravity from
point A to B on the smooth circular bar. Calculate the work of the forces
applied on the particle.

Solution:
·
Work
of N: N is perpendicular to the path at all times and, as a result, has no
component tangent to the path . Therefore, N does no work from A to B.
·
Work
of _{} and mg:
_{}
_{}