Question

define: 1)rigid body 2)point of action of force

Answer 1

Rigid body:-rigid body is a solid body in which deformation is zero or so small it can be neglected.
Point of action of force:-the line of action of a force F is a geometric representation of how the force is applied.
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Answer 2

1) A body can be termed as a rigid body, when the separation between the two particles of the body remains constant..although applying any deformation force or the body is in translation, rotation or rolling...thus a body can be termed as a rigid body...

2) The point of actio of force is the point where the force on the body acts. ..