The given masses m¡ are located at the given points Pi which are placed in the xy-plane. Find the total mass (m), moments Mx and M, with respect to the x- and y-axis, and the center of mass (x, ỹ ) of this system: m, = 3 kg placed at point P, (-1, 1), m2 = 4 kg placed at point P2 = (2, –1), and m3 = 8 kg placed at point P3 = (3,2). Total mass (m) = тотеnt (M ,) %3 тотеnt (M ) - center of mass (x,ỹ)=
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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