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Week2_2

# Week2_2 - ENGR210 Fall 2011 Chapter 3 Equilibrium of a...

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ENGR210, Fall 2011 1 Chapter 3 Equilibrium of a particle (A particle has a mass, but its size can be neglected. So, the geometry is not involved in the analysis.) 3.1 Condition for the equilibrium of a particle Σ F = 0 “the sum of force vectors acting on a particle is zero” This is the fundamental equation in statics.

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ENGR210, Fall 2011 2 3.2 The free-body diagram (FBD) (Before learning FBD) Forces at connections “Springs” F = ks where k is the spring constant, s is the deformation of the spring The direction of a spring force is parallel to the spring.
ENGR210, Fall 2011 3 “Cables and pulleys” In this class, all cables (cords) will be assumed mass-less and inextensible. A cable can support only a tension. The tension developed in a continuous cable passing over a frictionless pulley is constant throughout its length. The diction of a cable force is also parallel to the cable.

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ENGR210, Fall 2011 4 Determine (draw) a coordinate system.
ENGR210, Fall 2011

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Week2_2 - ENGR210 Fall 2011 Chapter 3 Equilibrium of a...

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