Re: [Phys-l] momentum and energy

[Jack Uretsky <jlu@hep.anl.gov>]

I don't understand the notation.  I insist the students define their 
sumbols; that mightt help them obey your instructions.
					Regards,
						Jack

On Mon, 13 Nov 2006, Rick Tarara wrote:

> If the students don't think well algebraically  :-(  then you might try
> this.
>
> Pull these equations out of a textbook (my students did for their last
> test--despite instructions not to do that kind of thing):
>
> Elastic collision with M2 initially at rest
>
> V1F = (M1-M2)V10/(M1+M2)
> V2F = 2M1V10/(M1+M2)
>
> Now assume an elastic collision and calculate for different masses of M2
> (the wall):
>
> Taking M1 = 1 and V10 = 10 --->  KE0 = 50
>
> M2    V1F    V2F   KE1F   KE2F
>  1        0        10       0            50
> 10      -8.2    1.8     33.5        16.5
> 100     -9.8    0.2     48             2
> 1000  -9.98   .02     49.8         .2
> 10000 -9.998 .002  49.98       .02
>
> The trend now should be obvious--you can extend this (took 3 minutes to
> program a spreadsheet .)
>
> Rick
>
> ***************************
> Richard W. Tarara
> Professor of Physics
> Saint Mary's College
> Notre Dame, IN
> rtarara@saintmarys.edu
> ******************************
> Free Physics Software
> PC & Mac
> www.saintmarys.edu/~rtarara/software.html
> *******************************
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l

--
"Trust me.  I have a lot of experience at this."
		General Custer's unremembered message to his men,
		just before leading them into the Little Big Horn Valley