Placing a small sphere at point A, the rod is a released at an angle of approximately 60 degrees to horizontal. Fixed point of rotation at O. Surprisingly (!), the sphere will move downwards slower than the rod and will land in the cup. O O By calculating the downward acceleration of point A on the rod we can explain the result!
Rigid Body
A rigid body is an object which does not change its shape or undergo any significant deformation due to an external force or movement. Mathematically speaking, the distance between any two points inside the body doesn't change in any situation.
Rigid Body Dynamics
Rigid bodies are defined as inelastic shapes with negligible deformation, giving them an unchanging center of mass. It is also generally assumed that the mass of a rigid body is uniformly distributed. This property of rigid bodies comes in handy when we deal with concepts like momentum, angular momentum, force and torque. The study of these properties – viz., force, torque, momentum, and angular momentum – of a rigid body, is collectively known as rigid body dynamics (RBD).
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