4. Discussion

4.1 Key finding

From the data we collected, We could deduce that the surface area of the nails effects the maximum mass the ballon can withstand.

4.2 Explanation of key findings

This shows that the formula to find pressure is true, force/area, and can apply to many real life examples like tires. We found after Test 9, that there was a huge increase in mass the balloon could withstand, thus showing us that it might be the suitable surface area for most rubber materials like tires.

4.3 Evaluation of hypothesis

Our hypothesis 'When the surface area of the nails decreases, a lesser force is needed to burst the balloon. If there is an increase of surface area of the nails, a greater  force is needed to burst the balloon."

Our hypothesis was proven to be true with the amount of mass needed to burst the balloon increase as the surface area of the nails increase.

4.4 Areas of improvement
Our experiment could have been more accurate if we had used a more reliable and accurate way to keep the size of balloons as constant as possible.  Because if the surface area of the balloon is different, the mass cant be evenly distributed every single time thus affect the results.  

Other area of improvement is that we could have bigger planks as then we will be able to have bigger and longer books and we wont need to fold them. When we fold them, still some was not able to fit in nicely and rubbed on the rods, creating frictional force and might have affected our results. 

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