10-02-05

Doc Zone Episode on Hyper Parents & Coddled Kids http://www.cbc.ca/video/#/Shows/Doc_Zone/ID=1404802913

Elevator Lab Data (Homework assignment) - measurements in lbs.: Note: use 9.8 m/s2 for g
 * || Mass Reading "up" (start of journey) || Mass Reading "down" (start of journey) || Mass Reading "stationary" ||
 * A || 140 || 110 || 120 ||
 * B || 145 || 105 || 125 ||
 * C || 219 || 165 || 194 ||
 * D || 203 || 155 || 172 ||
 * E || 140 || 110 || 128 ||
 * E || 142 || 108 || 128 ||
 * F || 220 || 160 || 180 ||
 * G || 242 || 192 || 215 ||
 * H || 160 || 118 || 135 ||
 * I || 200 || 155 || 175 ||

F(spring) - F(gravity) = F(net) m(up) x g - m(stationary) x g **//= m(stationary) x g = m(stationary) x acceleration

m(up) x g - m(stationary) x g = F(net) = m(stationary) x a //** the trick is to get the signs correct.