# Lecture 4 - ENGR-1100 Introduction to Engineering Analysis...

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ENGR-1100 Introduction to Engineering Analysis Lecture 4 Notes courtesy of: Prof. Yoav Peles

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Homework Assignment (due next class) Problem 3-9 Problem 3-11 Problem 3-12
Lecture outline Free body diagrams Equilibrium of a particle - two dimensional problems

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What do we call “a particle” in this course? Large bodies or small bodies can be referred to as particles when the size and shape of the body have no effect on the response of the body to a system of forces. The mass of the body can be assumed to be concentrated at a point and the shape is neglected. Necessary and sufficient condition for equilibrium is: R = Σ F = m a = 0 where Σ F is sum of all forces acting on the particle.
Free body diagram (this is VERY IMPORTANT!) A carefully prepared drawing that shows a “body of interest” separated from all interacting bodies. The forces exerted by all other bodies must be determined and shown on the diagram.

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