Whiteboard: lecture notes on forces, interactions

#CuestaPhys205A students: whiteboard #phys101 lecture notes on weight force pic.twitter.com/k1NsOPAU9J

— Patrick M. Len (@Patrick_M_Len) September 12, 2013

#CuestaPhys205A students: whiteboard #phys101 lecture notes on tension, normal forces pic.twitter.com/jafqz8QokD

— Patrick M. Len (@Patrick_M_Len) September 12, 2013

#CuestaPhys205A students: whiteboard #phys101 lecture notes on static/kinetic friction ("Max" is the elephant's name) pic.twitter.com/UImOy97ecH

— Patrick M. Len (@Patrick_M_Len) September 12, 2013