enumerate the nature of the force which may be omitted in forming the equation of virtual work
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The forces which may be omitted in forming the equation of virtual work are:
1. Forces applied to fixed points (ds = 0).
2. Forces acting in a dirn normal to the disp (cosα = 0).
3. Reaction at a frictionless pin due to rotation of a body around the pin.
4. Reaction at a frictionless surface due to motion of a body along the surface.
5. Weight of a body with cg moving horizontally.
6. Friction force on a wheel moving without slipping.
The sum of work done by several forces may be zero:
1. Bodies connected by a frictionless pin.
2. Bodies connected by an inextensible cord.
3. Internal forces holding together parts of a rigid body.
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