There are two possible outcomes. The middle block could move and the other two blocks could remain stationary. The other possibility is that the two bottom blocks could move as a unit. We will investigate both possibilities. First, assume that the middle block slips while the other two blocks remain stationary. The free- body diagram is shown. Find the magnitudes of the two normal forces N1 and N2 that act in the directions shown. N, F 362.97 N F, N, Answers: N1 = i N N. N

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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).