Measuring acceleration - Couple of videos

Using a mass over a pulley and a light gate to measure the acceleration due to gravity.

 or using the old fashioned ticker tape timer to measure the trolley accelerating down a slope

Diffusion ISA Ideas for AQA

One way of doing this experiment is to add a crystal of KMnO4 to a large beaker containing 1 litre of water and waiting. In the images the breaker on the right was at 65C and the one on the left at 12.9C.

A small crystal of KMnO4 was dropped into the beaker and left for a short time.

The only problem with this experiment is that it is very difficult to quantify the rate of diffusion, so we are going to modify this experiment and use a colorimeter instead.

The better alternative.#

We used a colorimeter with pasco Sparkview software to observe the rate of diffusion.

A small crystal ( just under the cuvette in the picture) was placed into the cuvette and added to the colorimerer which recorded the results.

Measuring the green absorbance the graph above was produced as the KMnO4 cystal dissolved and spread throughout the hot water.

Classic results for NaOH and HCl titration

Getting a classic set of results for the  titration of NaOH and HCl is not that difficult but it is nice when we can get students to this first time every time.

We are using the Pasco sensors and the Capstone software to capture the information.

In this experiment we are titrating NaOH against HCl.
 We set the burette dripping at a constant rate and then measure the temperature change and the pH change using probes.

The magnetic stirrer ensures the compounds are well mixed and the Sparklink Air delivers the information to the laptop where the information is captured instantaneously.
The experiment is quick to set up and easy to use, and most importantly very easy to replicate.

Knitting some Intestines

We went to the Bett Show a few weeks ago and there we saw a model of a Liver. It had been knitted so we thought we would have a go. After much searching on the net we finally found a pattern and so we have started.
The Model is life sized. We have started at the anus and rectum and we are now starting work on the large intestine. The small intestine is about 27 feet long itself and so will take a considerable amount of time to do.

Day by day the knitting goes on and the stuffing of them. The large is about half done in the picture.

Over the weeks the intestines continue to grow.








The large intestine is complete and now 20 feet or so of small intestine needs to be knitted.