Tuesday, December 16/08

Sorry for the late post, for thsoe who check this blog regularly, I kinda forgot and just remebered this morning. Well Yesterday we didnt do much. We learned about the weight and scale and how it REALLY feels when you move it up or down. We were also given a Lab to do which is probably due today if anyone is unsure.

Heres the notes she gave us, please make sure to correct me if I'm wrong because I'm writing this based on memory.Also sorry that I can't post any diagrams to explain this better.

F=mg

At this point the weight is at rest so it will feel normal.

F=mg + ma

You move the weight and scale along with it up and this is how it will feel...
It will become heavier at first then at a constant velocity you will feel normal. Then as you start to slow down as you reach the end the weight then becomes lighter.

F=mg -ma

This one is opposite direction with the opposite affect. You feel light at first as you move the weight and scale in the downward direction, then at constant velocity it feels normal. When you the start to slow down towards the end it will then become heavy.

*NOTE* When I say it feels normal it just means you can't tell if it got heavier or lighter then before.

The Lab...

For those who were confused on what they needed to do

What we had to do was get a rubber thingy(don't rember what its called) and tie to to a piece of string that is about 1.5 m's long. You then shorten the string by rolling in your hand to get 1.2m, 1.0m, 0.8m, 0.6m, 0.4m ,0.2m. These are the different lengths that you will be measuring how much time its takes for it to swing twenty cycles( one cycle equals the time it takes for it to come back from where you started it. Remember to start the rubber stopper up to the right of you and keep hand still will doing experiment. Its quite annoying to hold all the time so switch places with your partner if your arm feel tired. Record all the data 3 times each. Then average your time. The period is calculated by the (average time/20 cycles it did). Of course do the Analysis questions after you have completed this experiment and dont forget to hand in.

Sorry once again for the late post as I COMPLETELY FORGOT even though I was told before hand. :S

The next scribe I choose will be Alex Sharp. So good luck Alex with next scribe.