Re: [Phys-l] crutches versus shoes

["LaMontagne, Bob" <RLAMONT@providence.edu>]

How anachronistic. Most students simply go on "PhysicsForum" and ask others to supply the answer.

Bob at PC

> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
> bounces@carnot.physics.buffalo.edu] On Behalf Of chuck britton
> Sent: Tuesday, April 19, 2011 11:11 AM
> To: Forum for Physics Educators
> Subject: Re: [Phys-l] crutches versus shoes
>
> At 9:15 PM -0400 4/18/11, Anthony Lapinski wrote:
> > Do we want our students to solve a problem like this?:
> >
> > A train traveling from New York to Chicago is moving at 110 km/h when
> the
> > engineer sees a stalled car near the track ahead. The train brakes to
> a
> > halt in 1.2 min with a constant deceleration, stopping just next to
> the
> > car. How far was the train from the car when the engineer first
> applied
> > the brakes?
>
>
> My students would read the problem and say:
>
> OK, I need to find the area under the velocity-time graph that I have
> just sketched here on my paper.
> The base is 1.2 minutes and the height is 110 km/hr.
> The area is 1/2 (1.2 minutes) x ( 110 km/hr) = 66 km minutes / hour.
>
> Then they would clean up the units - having already shown the physics
> involved.
>
>
> (Well, I remember a FEW who would have done it that way ;-)  )
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