... affect one part. For example. It is possible to change the length of the handles of the wheelbarrow, which would be the same as moving the load further away from the handles. Therefore, the possible variables to test are: * Changing the length of the handles of the wheelbarrow. * Changing the size of the wheels, where the smaller the wheels are, the more difficult it would be to push the wheelbarrow * Changing the shape of the bucket, this would mean that if the sand was spread in a wider area, the wheelbarrow would be a lot more difficult to balance. If the bucket was narrower it would be more difficult to lift, and if it was too high, it would also be a problem to balance because its centre of mass would be far too high. * Changing the distance of the effort from the pivot would mean changing the ...

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