2 - Exam correction and remediation - Statics
Part Two of the Theoretical Mechanics Exam: Statics, or the study of bodies at constant velocity or at rest.
This exam question involves determining the various forces acting on a body.
Although the situation varies each time, we encourage you to always use the same method:
0) Divide the problem into several systems.
1) For each system, draw the forces:
weight;
constraints (strings, etc.);
supports and friction.
2) Choose a coordinate system, ideally with x in the preferred direction of motion.
3) Write and solve the equations of statics, noting that the sum of the forces is equal to 0 (translation) and that the sum of the moments is equal to 0 (rotation). As a reminder, moments of force can be calculated using the lever arm as follows: M = Bdl * F, where Bdl is the lever arm, i.e., the perpendicular distance between the axis of rotation and the line of action of the force.
This video corrects the question given in the January 2024 exam at the EPHEC University College and provides a review of the topic. The aim is to present the essential points to know.
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