Over vs. Under: The great toilet paper debate

How do you control the roll?

BALTIMORE - Over or under? Do you have a toilet paper preference?

Believe it or not, there’s a science to this.

"If you have the over case and you're applying that force up here," said Towson University Physics Professor David Schaefer.  “Then the distance away that you are applying that force will produce a certain torque."

So what happens when you pull from under?

"You're applying that same force at a farther distance away," said Schaefer

 “You have to control the roll,” he added. "We want it to rip and not rotate."

Schaefer explained the goal is not about speed, but about being efficient and not pulling off more paper than you need. 

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