C) Fig. 7 Temperature of ball versus height of bounce.
Reviewing and reflecting on the experiment In this experiment the bounce was only measured once at each temperature so it is not possible to tell if the results are precise. This investigation could be improved by making several measurements of the bounce at each temperature. Temperature and bounce were changed in this experiment but other things could also change
such as the height from which the ball is dropped and the surface on which it is bounced. These factors could affect the results of this experiment. To make sure they do not affect the results they must be kept the same throughout the experiment. This ensures that the experiment is fair.
2 (a). An observational experiment that collects qualitative data A scientist was walking through a woodland and came across a rock which had moss growing on just one side. As she continued walking she noticed that all the rocks had moss only on one side. Using a compass the scientist found out that the moss was on the north face of the first rock. She then used her compass at each of the other rocks and found the same pattern. The moss only seemed to grow on the north face of the rocks. The scientist then went to other wooded areas in other parts of the country. She found the same pattern. Because the sun is mostly to the south in Ireland, she formed the hypothesis that moss does not grow in direct sunlight. Based on this hypothesis she made a prediction that in the southern hemisphere where the sun is mostly in the north, moss would be found growing mostly on the south face of rocks. She later found out that this is the pattern of moss growth in New Zealand.
