### Power pack and nichrome wire

1. Start of by cutting out six different lengths of nichrome wires of the same brand and thickness (10cm, 20 cm, 30 cm, 40 cm, 50 cm and 60 cm respectively) from a reel using a meter ruler. Do Note – Three wires of each length were cut out i.e. there were three wires of 10cm, three wires of 20 cm and so on. 2. The ammeter, power pack and nichrome wire (about to be tested for resistance) are connected in series using connecting leads.. Basically refer to the diagram displayed below as the experiment set up is exactly similar to that.

The propulsion ability of a rubber band is determined by numerous factors, which relate directly to the rubber band itself (e.g. spring constant), as well as how the rubber band is projected (e.g. the angle of propulsion, friction on the object…). The factors that will affect the efficiency of a rubber band as a propulsion device are too vast to simply investigate in one single experiment. Ultimately the decisive factor for the efficiency of a rubber band as a propulsion device will depend on the elasticity; hence this experiment will focus on how heat will affect the elasticity of the rubber band.

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Research Question: How does heat affect the elasticity of a rubber band? Hypothesis: Understanding that the rubber band is a polymer, and will go through stages of glass range, elastic range and viscose range, I am quite sure that at extreme low temperatures, the rubber band will be brittle and break. As one would observe a garden hose crack easily on a winter day. On the other end of the extreme-extremely high temperatures, I am sure that it would melt the rubber band, loosen the molecular binding force amongst the atoms and cause it to enter a viscose range, liquid like, and not able to stretch at all.

My assumption is that the room temperature maybe the most suitable environment to enable the highest performance. Yet knowing that these stages aren’t definite periods, hence my hypothesis is that the extremities of heat will decrease the elasticity of the rubber band, whilst close to room temperatures will be the optimal condition for performance, and the mathematical relationship will no be linear, but rather a series of different slopes, resulting on both ends as horizontal lines.

I will average the data for each temperature group, and use these averages to plot a diagram of heat in relation to elasticity. I will see if I can observe a mathematical relationship, and calculate the function of it. Yet there is another error I only have 5 points of a temperature, and this polymer is almost surely not going to be a linear function, hence 5 points will not be sufficient to graph the graph precisely. 3. Connect the voltmeter in parallel to the circuit.

4. Next, turn on the power pack which is adjusted to the voltage we are working with (note, as previously mentioned, the voltage is a controlled variable therefore it is kept constant). At the same time start the stopwatch and begin timing. 5. When thirty seconds have gone by (as mentioned previously, we are working with 30 s time intervals), the readings of the ammeter and the voltmeter must right away be taken. 6. This is repeated thrice for each length of nichrome wire since we are experimenting with three wires of the same lengths. Therefore we are going to be recording the data for three trials. 7. After that we primarily repeat steps 4 to 6 for different lengths of nichrome wire.

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