PHYSICS 1A03 Lecture Notes - Lecture 10: Friction

• School: McMaster University
• Department: Physics
• Course: PHYSICS 1A03
• Professor: S. Cormier, K. Dalnoki-Veress

Document Summary

Quiz on t2m3 & hw on capa 3. Diagram that represents all forces acting on an object. Do not draw forces acting on other objects; Do not draw forces caused by this object; Do not include a force for ma term; Draw arrows pointing outward from the object. The friction force response to an increasing applied force. |f| fs,max fs fs,max = sn fs=f fk = kn. The object is not moving ; f = 0; use the static friction fs fs,max = sn. The object is moving, but velocity is constant (a=0) F = 0; use the kinetic friction fk = kn. Now f=ma, at least one direction ; use kinetic friction. Summarize from questions: a block of mass m is on a rough surface, with a spring attached and extend. In total, there are five forces: there are two people, one is a 140-kg wrestler and a 40-kg kid, they try to push each other backwards.