water tension dlo

 

Title:DLO	Water Tension DLO
Question	How much tension can multiple water droplets hold?
Research	Test water tension on a 20c coin
Hypothesis	Can the coin hold 8 drops on the heads side?
Experiment Equipment method	We got given a straw, A flask of 20ml of water and a 20c coin.  We used the straw to collect the water by sealing the pressure on the top of the straw and slowly releasing the pressure of the water to make a water droplet fall on the coin.
Collect Data	7 drops on heads side, 18 on tails side.
Analyze	We could fit 18 droplets on the tails of the coin.
Conclusion	We think that this was the limit because we couldn’t manage to fit anymore droplets on the coin. There was another group that could only get to the same amount.
Report	We had a hypothesis and that was how many droplets of water could fit on a 20c coin. We estimated 5 droplets of water on the heads side of a 20 cent coin, the result we got was 7 drops of water on the coin before the surface tension burst and the water flowed off the coin!

my bike trail recount

 My Bike Trail Recount 

On the 26th of May my class went on a bike ride to Hurunui Jacks and Mananui Tramline near Hokitika. My car group was Robyn, Matt , Luken, Charlie and me  We started early in the morning at about 8:30 am and set off at 9:00am. 

We arrived with are gear pack and a full stomach. There was frost everywhere. There were old relics everywhere  old shovels pieces of a railway from possibly 100s of years ago. It was very exciting. We also had to stop every 20 minutes nearly to read the bearings of our compass. 

There were a few downhill parts which were very fun. I had a little bit of trouble switching between gears but got the hang of the new bike gears. We had lunch when we reached the end. Most of us just rode off the 30 cm drop off the wood panels of the car park. 

We set back off to the cars. I was going faster than I was on the whole track. It was 200 meters down hill. I was going fast enough to catch up to the rest of the group up front but of course I was confronted by another incline. There were large wooden bridges with a narrow appearance but when I started to slow they did not seem such a risk. 

We got to the end and it was time to load the bikes  and set off to the Hurunui Jacks bike trail (with a quick petrol stop in Hokitika).

We were at Hurunui Jacks with big water races to the side of us. We had lunch and began. I was one of the first to take off. There were big turns and dirt and gravel roads. It was challenging at first but it kept  getting harder and harder as we went more and more up inclines until we got to a nice flat gravel part. Of course there was a down side, there is always a down side... on my right a steep 20m hill and on my left a 2m water run for about 20 minutes straight then some bends and slopes. There was a noise to the side of us which turned out to be a road. I was delighted we were at the end! 

Ms Kemp sent Mylah, Emma, Ilish and I to wait for the others at the start of the track and Donna was to take them there. We had a long drive there but we all got to sit in the horse float with the stretcher like beds folded out. We then ate chocolate cookies and had a run around. 

A man arrived. It was just some old dude who wanted to talk to Donna about the cycle trail. Slowly he went away. We waited and waited for the rest of the class to come back but they came eventually we loaded up the bikes and left back to school.