Archive for March 2011
Chicken soup for the mathematical soul
Posted by: Gary Ernest Davis on: March 27, 2011
A few Twitter posts, following on the EdReach article “Khan Academy: Great Idea- With One Glaring Hole“, leads me this sunny New England Sunday morning to make a plea. The plea is based on the outstanding series of videos posted by Dr. James Tanton on his site Thinking Mathematically! Jim Tanton (@jamestanton on Twitter), a […]
Kinetic energy – when a vehicle stops suddenly, the energy has to go somewhere
Posted by: Gary Ernest Davis on: March 26, 2011
It’s an intuitive feeling that when we are driving a car, doubling our speed doubles our danger. Sadly, this intuition is not correct. Doubling our speed quadruples our danger. The momentum of a car is the product of its weight (mass) and its speed (strictly speaking, the product of its mass and velocity). Momentum doubles […]
