LIFESCI 3J03 Lecture Notes - Lecture 4: Ground Reaction Force, Free Body Diagram, Rigid Body
14 Sep 2016
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Life sci 3j03 lecture 4 static equilibrium of rigid bodies (2-d) Prof office hours: wednesday 11:30 1:30 iwc 206. Motion or lack of motion of any body is caused by a system of forces. Forces includes both internal and external forces: external forces would be the ring on the hand and the gravity force, internal forces would be the shoulder muscles and the joint reaction forces. External forces can be measured with appropriate transducers but the internal forces are much more difficult to measure directly. A rigid body is in static equilibrium when the sum of all the forces and moments acting on it are equivalent to zero: fx=0, fy = 0, m = 0. First must resolve each of the forces into x and y components: calculate the moment of each force about the axis. Draw free body diagram and use equations of motion. An isolated drawing of an object that is assumed to be rigid.
