Phys-teach-talk Digest, Vol 10, Issue 2

[Jonathan Jaffrey]

Hi,
I've done sets of Level 2 US6378 Mech & US6386 Graphs and Level 3 US6395
Graphs. Stopped doing US6378 since hardly anyone passed that didn't also
pass AS2.4 Mech. I'm very happy to share sets of those three (email below).
The problem with all these old US is they urgently need a rewrite. The range
statement means you must demonstrate ALL of that range unless it says "two
of....". For many Physics US with lots of elements and large range
statements it makes them very time consuming to assess, reassess, etc.
Talking of sharing: I've suggested to David Housden that we all use the new
NZIP website to upload our best resources so we can all then download & use
the best bits. I tried to start the process & put on some L2 Mechanics
PowerPoints. Hopefully some of the lonely wobbly things we all try to
reinvent in isolation will come to approximate a circular wheel!!
Cheers,
Jonathan (jjaffrey at slingshot.co.nz)

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Today's Topics:

   1. Weight and gravity (Graham Foster)
   2. unit standards (andy dyson)


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Message: 1
Date: Mon, 13 Oct 2008 12:39:00 +1300
From: "Graham Foster" <fs at eggs.school.nz>
Subject: Weight and gravity
To: <phys-teach-talk at nzip.org.nz>
Message-ID:
	<6141F841E6EC79488E285EC9E8AFA0CB6C6F1F at epsomex.eggsakl.school.nz>
Content-Type: text/plain; charset="us-ascii"

Greetings

 

Our discussion at EGGS continues about the differences between 'weight'
and 'gravity'.

 

We used to distinguish between the two by indicating that gravity force
is the attractive force of the Earth on an object and is evident during
free-fall motion when no reaction force acts.

 

Weight is the force of the object on another surface that it is contact
with. 

 

This implies that when we are in free fall e.g in Earth's orbit, there
is gravity force on the object but it is weightless since there is no
reaction force

on the object. 

 

Do other Physics teachers distinguish between 'weight force' and
'gravity force'?? If not why? if so why?

 

Thanks

 

Graham Foster

 

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Message: 2
Date: Mon, 13 Oct 2008 23:47:47 +1300
From: "andy dyson" <andydyson at actrix.co.nz>
Subject: unit standards
To: <phys-teach-talk at nzip.org.nz>
Message-ID: <011901c92d21$21ff7410$3c879aca at KKHS1>
Content-Type: text/plain; charset="iso-8859-1"

Hi All,

I have been doing some US this year and have used some US tests from various
places and tried writing some based on the US performance criteria.

Looking at US6397 for level 3 mechanics I have element 1 asking for three of
: angular displacement, initial angular velocity, final angular velocity,
angular acceleration, time. Calculations and units.

Element 2 asks for rotatioal kinetic energy, gravitational potential energy,
torque, rotational inertia and angular momentum. Calculations and units.

My question is: For element 2 do I need the students to satisfy all the
conditions or just one of them?



By the way, does anyone have loads of US tests that they are willing to
share with me? I am writing things myself but feel that I must be
reinventing the wheel. I'll show you mine if you'll show me yours.

Andy,

Kerikeri.

PS: Try sinking a pyrex test tube in peanut oil. The kids love it.
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