Engineering Mechanics
Engineering Mechanics. Instructor: Professor Manoj K Harbola, Department of Physics, IIT Kanpur. In this course, we would be studying mechanical interaction between different bodies when they interact through the forces applied on each other. Topics covered in this course include Review of Newton's laws of motion and vector algebra; Equilibrium of bodies; Plane trusses; Friction; Properties of plane surfaces; Method of virtual work; Motion of particles; Momentum; Work and energy; Rotational kinematics and dynamics; Simple harmonic oscillator; and Motion in non-inertial frames. (from nptel.ac.in)
| Lecture 10 - Equilibrium of Rigid Bodies - Forces and Torques |
This lecture discusses the meaning of equilibrium for point masses and extended bodies. It is explained that while the equilibrium condition for a point mass is that the net force on it vanish, for extended bodies an additional condition is required because extended bodies have a tendency to rotate under an applied force. This additional condition for equilibrium, besides the net force vanishing, is that the net torque on an extended body should also vanish. How is the torque calculated by taking the vector product of the distance and the force is also discussed in this lecture. At the end, some problems are also solved to illustrate the concepts discussed.
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