Thoughts about the results

My hypothesis turned out to opposite to the results because I proposed that the square aluminium would be the strongest but it turned out it was the weakest. I thought it was the strongest because it contained metal which made me think of the strength of steel. However, plastic is flexible and circle has the largest general width which is the diameter of 5.6cm (2.8cmX2). The square and the rectangle have about the same strength so the large range of results were mainly due to the weakness of aluminium foil. Bags distributed from shops are made of plastic with circular endings which is more environmentally friendly than paper bags as they are biodegradable. Also, this agreed with my results because circular plastic was the strongest material and/or shape. Cling wrap is a thinner form of plastic which clings together for strength.