Clearly the graphs follow a near consistent path, with no erratic values. Inevitably error bounds occur, but these are low in relation to the range of d, smaller than 4cm. The values lie within 3cm of the line best fit and the furthermost value.

On average, by observing the plotted data error bounds are about 2cm. The larger d the smaller the error bounds. The error bounds are similar throughout values of q . But consistently greater the smaller the value of l. At a small distance of l a small error in positioning the ratchet socket would make a larger error for d than when l is large.

There are several possible explanations for the variation in results. Any tests taken in a human environment are prone to variation. Errors could be made as the ratchet socket was placed on the slide. It might have been off the exact value of l, the distances of l might be marked incorrectly on the slide.

Observations of where the exact point of impact by the ratchet socket on the paper is inclined to error. It is also possible that a dent from another value of l was taken by mistake. This, however is unlikely as no values overlap with other set values of l.

Other possible reasons for the slight errors could be the result of numerous unaccounted resistive forces. All points follow a similar curve shape, therefore a relationship between l and d can be applied using a theoretical model.