Suppose your teacher is showing a thought experiment in a gravity free space. He struck a thin rod of M and length L at one end by a clay ball of mass m moving with speed v. The ball sticks to the end of the rod. Now to check your knowledge about rotational mechanics, he asks you to find out the angular momentum of the clay-rod system about the midpoint of the rod. Select the correct answer.
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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