Re: [Phys-l] possible projectile lab

["Souder Dwight" <souder.dwight@crestviewschools.net>]

Anthony,
 
Do you use photogates to measure the velocity or do you use meterstick and stopwatch?
 
What do you do if it travels the correct distance, but went too far to the side?
 
Thanks,
Dwight

________________________________

From: phys-l-bounces@carnot.physics.buffalo.edu on behalf of Anthony Lapinski
Sent: Thu 12/17/2009 7:01 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] possible projectile lab



I do a variation of Hewitt's lab, "Bull's Eye." See his lab manual for
details.

In this case, roll a marble down an incline, and time how long it takes to
go a horizontal distance until it reaches the edge of the table. Using d =
vt, you can find the average velocity. And since friction is minimal, this
velocity equals vx -- the speed the marble leaves the table.

Place a can, ring, etc. on the floor. Students measure the vertical
height, calculate flight time, and horizontal distance, x. Place the can,
let the marble roll, and see if it lands in the cup. It's fun, and the
physics works! Can also analyze errors if marble lands to short/far.

Physics is PHUN!!


Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu> writes:
> Soon, my physics students will be covering projectile motion.  I've been
> thinking of doing a new lab, but wanted to see if someone else had
> already done it, and/or suggestions.
>
> I'm thinking of having the students roll marbles down an incline, have it
> roll across the lab table a short distance, and mark where it lands on
> the ground (get an average of its landing distance).
>
> > From the information as to where it lands and the height of the lab
> table, the students would then calculate its initial horizontal velocity.
>
> Then comes the challenging part.  I'm thinking of giving the students 2-4
> rings (about 2-3 inches in diameter) and they would have to place them
> in equal intervals of the marble's path, so that the marble passes
> through each ring. 
>
> Has anyone done a similar lab?  Any suggestions?  If someone has already
> done this, could someone email me their lab?
>
> Thank you in advance,
> Dwight
>
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