Cool fact about bike versus car energy

[RoadRaven]

Someone posted this a few days ago - maybe last week?

Their daughter had walked into the room and stated a fact about energy expenditure with cyling and cars I think... I can't quite remember, but one of my sons wants that fact for his homework (I had read it out loud to the family)...

Can anyone remember where the post is, or who started it so I can search under their name???

I was sure I had "subscribed" to it so I wouldn't lose it - but unfortunately I hadn't...

Thanks in anticipation

[KnottedYet]

I read that too. Was it on BikeJournal?

[RoadRaven]

Maybe - I thought it was here... but I'll go check out out BJ now...

[RoadRaven]

Nope... can't find it in Bike Journal either...

Any ideas anyone???

[HoosierGiant]

That was me. I believe the thread was called Physics Lesson.

[RoadRaven]

Thanks Hoosier
I popped back in a few times on Sunday without logging in and he was really pleased to your post.

"A bike turns 90% of your energy into movement, so it's the most efficient transportation in the world."

He is 16 and preparing a speech for later this week for his physics class on the energy efficiency of bicycles... I didn't even realsie what he was doing until he came and asked about your post.

Anyways, I googled something like...

are bicyles more efficient than cars

... and I got loads of links

Here are 3 I showed him

http://www.exploratorium.edu/cycling/humanpower1.html

http://www.eco-living.net/writings/t...effengine.html

http://gotoes.org/bikestuff/index.htm

One of these has pics of the guy towing a length of fence, a couple of trees, a couch and a piano!!! On his trailer with his legs as engines!!!
Pretty impressive!