You pull on a string with a horizontal force of magnitude Fyb = 56 N that is attached to a block of mass m = 6 kg, then to the axle of a solid cylinder of mass me = 4.8 kg and radius r = 0.4 m, then to a spring of spring constant k = 60 N/m. This is all done on an inclined plane where there is friction (μs = 0.64 and μ = 0.38), and the incline angle is = 31 degrees. Everything starts at rest, and the spring is unstretched. The block slides down the plane, the cylinder rolls down the plane (without slipping), and the spring stretches. k belllllll b 0 Fyb

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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).