pxblog-June2007

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Wednesday 16 Feb 2010
From Jamie I am currently working through PX201 – Motion and am up to activity 7a. I was just wondering if you could please explain to me how you decide which of the four equations you are supposed to use? e.g. v2=v1+at, d=1/2//x//(v1+v2)//x//t , d=v1t+1/2a(t)^2 and v2^2=v1^2+2ad Thanks, Hi Jamie What you should do is list the quantities you have been give and the one you have to find. Check out this problem: - Problem: A train is travelling at 40 m/s and decelerates at 2.5 m/s2. What distance does it take to stop? Hint – remember ‘to stop’ means a velocity of 0 m/s. Solution v1 = 40 m/s v2 = 0 m/s a = - 2.5 m/s2 d = ? Look to see which of the formulae has these four quantities in it. In this case it is v22 =v12 + 2ad The method will work with other problems as well. <span style="color: #1f497d; font-family: "Calibri","sans-serif"; font-size: 11pt;">Tish

About Optics/ Px 206 and 207 booklets
From: hudhououd zalat Hi I'm having trouble completing activity 5B because i don't have a biconvex lens and i don't know where to get one from, would it be ok to miss these questions thank you Hi Huda However, I recommend doing the following. Log-onto our blackboard site. Got to Px200/ PHeT (you?ll need to scroll down the Px200 page). In the PHeT page choose Physics/Light &Radiation/Geometric Optics. That SIM will do all that is done by using the actual lens. Tish

Thursday, July 5, 2007
I no you are on holidays at the moment and that by the time you come back that booklet will be finished .But i really need to understand vectors! I am COMPLETLY lost at the moment, ive asked my sister to help me because she did year 12 physics last year but she said she never understood it.

Ah vectors! Yes - they another kind of number, one which has a size AND a direction. So they are mostly used for measuring things like velocity (speed in a certain direction), acceleration, force and momentum.

It does mean we can't add or subtract them directly - you have to draw a 'vector diagram' of arrow, usually a triangle. One arrow represents each vector. You draw the first, then start the second at its head. Finally complete the triangle so the side from the tail of the first arrow to the head of the second arrow is the resultant - the sum of the two arrows.

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Tish Glasson
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TishI’m Tish Glasson and I’m one of a team of Physics teachers in our Science department at The C0orrespondence School of New Zealand home