Re: [Phys-L] sharing an activity on free-body diagrams

["Rauber, Joel" <Joel.Rauber@SDSTATE.EDU>]

Kauko,

Just curious, I looked at the link provided below, why is everything from >Teaching physics on in English?  I'm guessing it's for ease of communication with colleagues who do not read Finnish?

-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of Kauhanen Kauko
Sent: Wednesday, December 11, 2013 12:35 PM
To: phys-l@phys-l.org
Subject: [Phys-L] sharing an activity on free-body diagrams

Seasons greetings from Finland!

Thanks Phil for nice set of exercises!

I have been working on FBDs with my high school class and I agree that FBDs are among the most difficult topics to master for kids (and often for their teacher, too).

I wanted to share some of the material with you - I use drawings and photographs of objects and sometimes let the students to use laptops to draw the forces. They seem to enjoy working in pairs and trying to find relevant forces. I can quickly evaluate or comment their work and give a different exercise to follow.

I have found it useful to give a pair of FBDs at the same time. There is an example in the following link of the traditional car pushing a lorry dilemma, where you have to draw an FBD for both vehicles. Or you might give a pair where the movement is different, or slope etc. This enhances the discussion on how small variations change the forces.

http://www.peda.net/veraja/kuopio/lyseonlukio/kurssit/fysiikka/opetus4/voimakuvioita

Kauko Kauhanen
Kuopion Lyseon lukio high school
Kuopio Finland
email: kauko.kauhanen@kuopio.fi

> Hi All,
> I gave my students this assignment today:
>
> http://www.holmdel.k12.nj.us/faculty/pkeller/word%20files/circular%20mo
> tion%20free%20body%20diagrams.pdf
>
> We have not started to discuss this material yet, so this was their 
> first look.  And I must say, I enjoyed listening to them working in 
> groups to puzzle this out.  After about 20 minutes, I gave them a hint:
> I revealed that the pairs all have the same free body diagrams.
>
> Mostly, I am sharing because my students seemed to enjoy working on 
> these and they certainly discussed them enthusiastically.  So if any of 
> you can use this, feel free.  But also, there were two that gave the 
> most trouble.  One I expected, but the other surprised me.  I'll let 
> you guess...
>
> Phil

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