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).
An air puck of mass m1 = 0.25 kg is tied to a string and allowed
to revolve in a circle of radius R = 1.0 m on a frictionless horizontal
table. The other end of the string passes through a hole
in the center of the table, and a mass of m2 = 1.0 kg is tied
to it (Fig. P7.27). The suspended mass remains in equilibrium
while the puck on the tabletop revolves. (a) What is the tension
in the string? (b) What is the horizontal force acting on
the puck? (c) What is the speed of the puck?
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