Two masses, 0.600kg and 0.300kg, begin uniform motion at the same speed, 0.800m/s, from the origin at t 0 and travel in the directions shown in Figure Problem 18.1. (a) Find the velocity of the center of mass in unit-vector notation. (b) Find the magnitude and direction of the velcoty of the center of mass. (e) Write the position vector of the center of mass as a function of time.
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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