The key difference between a particle and a rigid body is that a particle can undergo only translational motion whereas a rigid body can undergo both translational and rotational motion
Edward Washington Suppiger has written: 'An analysis of the motion of a rigid body' -- subject(s): Dynamics, Rigid, Rigid Dynamics
"The condition of equilibrium or motion of a rigid body is remain unchanged, if a force acting on the rigid body is replaced by another force of the same magnitude and same direction but, acting anywhere along the same line of action."
The degree of freedom of a rigid body when one point of the body is fixed is zero. This means that the rigid body has no motion at all as it is completely pinned down by the fixed point. Any movement of the rigid body would cause it to become non-rigid.The degrees of freedom of a rigid body are expressed in terms of six independent parameters which are:Translation in three orthogonal directionsRotation around three orthogonal axesWhen one point of the rigid body is fixed the body cannot move in any of these directions resulting in a degree of freedom of zero.
no body is truely rigid body because we observe rigid body at microscopic level
It has a rigid skeleton but the body is flexible.
because a rigid body can vibrate.
An elastic body will stretch when loaded. A rigid body willl not. A rigid body is a theortical body only in which stiffness is infinite.
Movement of a shape can involve flexing - for example, a square frame being flexed into a rhombus. Rigid motion excludes such motion: the shape of the moving object does not change.
dilation (APEX)
Stretch
Ajoy Batra has written: 'Initial spatial motion of a rigid body on removal of one constraint' -- subject(s): Computer simulation, Motion, Dynamics