12_ChapSummary

12_ChapSummary - SUMMARY The goal of Chapter 12 has been to...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
A system of particles on which there is no net force undergoes unconstrained rotation about the center of mass : The gravitational torque on a body can be found by treating the body as a particle with all the mass M concentrated at the center of mass. x cm 5 1 M 3 x dm y cm 5 1 M 3 y dm SUMMARY The goal of Chapter 12 has been to understand the physics of rotating objects. General Principles Rotational Dynamics Every point on a rigid body rotating about a fixed axis has the same angular velocity and angular acceleration Newton’s second law for rotational motion is Use rotational kinematics to find angles and angular velocities. a5 t net I a . v Conservation Laws Energy is conserved for an isolated system. Pure rotation Rolling Angular momentum is conserved if Particle Rigid body rotating about axis of symmetry L r 5 I v r L r 5 r r 3 p r t r net 5 0 r . E 5 K rot 1 K cm 1 U g 5 1 2 I v 2 1 1 2 Mv cm 2 1 Mgy cm E 5 K rot 1 U g 5 1 2 I v 2 1 Mgy cm Important Concepts
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/26/2010 for the course PHYS 021 taught by Professor Dick during the Spring '08 term at GWU.

Ask a homework question - tutors are online