Libertarian Parenting Part 3 - Professor David Friedman on Unschooling

Professor David Friedman talks about being raised by Milton Friedman, and how he unschooled his own children. http://en.wikipedia.org/wiki/David_D._Friedman

Category:

Education

Tags:

• libertarian
• parenting
• david
• friedman
• interview

[juneausucks]

i would like to hear the professors explenation why 2 cars @ 50mph colision is not like 1 car at 100mph into a brick wall. that peaked my curiosity

[stefbot]

@juneausucks I think it's because the brick wall does not have any momentum...

[thinkrevolution]

Stefan, you should grow your hair out like this guy. Haha

[LuciusSuperbus]

the whole Friedman family are such nerds. Cool though

[MutantBamHammer]

hmmm....the quality of the sound kinda falls apart after 32 minutes  :(

[zaxec]

@juneausucks Kinetic energy is (1/2) * (mass) * (velocity squared)

Assuming a 2 ton car, the total energy of the head-on collision of two cars going 50 mph would be 906.5 kilojoules.

The energy of the same size car going 100 mph and then hitting a brick wall would be 1,813 kilojoules -- about twice as much energy.

The reason for this is that squaring velocity makes higher velocity have a bigger impact (pun intended) on the total energy.

[glenra]

@juneausucks Suppose you're in one of the cars: The pain of the collision involves you having to slow down instantaneously from 50mph to 0 mph. You have that same subjective experience - the exact same sudden deceleration - whether your car stops dead from hitting another car exactly head-on or from hitting a brick wall at the same speed. If it helps, imagine the brick wall has a mirror on it so as you hit the wall it *looks* like you're hitting another car.

[TimothyADonaghue]

Stefan, why do you keep looking off to the side? Nobody's breaking into your house.

[MatjazL1]

@juneausucks The original situation is equivalent to the first car smashing at 100 mph into the other one that would be at rest. Obviously that's different than from hitting a wall that is at rest.

[reapfreak]

Damn. I wish this guy was my dad.

[alarlol]

VERY bad quality at the end...

[anthonyling86]

Sound starts to go bad around 36:00 over here!

[bclarke3]

@stefbot Its because yes there is twice as much force being involved, but it gets distributed amongst twice the mass. A car traveling 50 mph into a wall is the same as a car running into another car traveling 50 mph, because half the force is applied to one car and half on the other.