For each of the following case studies name the:- (A) independent variable (B) dependant variable
(C) Control variable (D) Draw a
results table for each.
Extension: For each of the variables state if it is continuous or discrete
Can you think of any ways to improve the experiments?
Case study 1 - Measuring gravity.
The aim of this experiment is to find out how fast objects of different masses take to fall from height. To conduct this experiment we used a number of different sized steel ball bearings, which had different masses. Each ball bearing was weighed on scales, before being dropped from a marker exactly 2 m from the floor. The time the ball baring took to drop was timed on a stopwatch, and repeated 3 times for each ball-bearing to gain an average time.

I would like to tell you a few words about my school life. I go to school five days a week except Saturday and Sunday when I have deserved rest. Classes in our school start at 8 :30 o'clock in the morning and last till 15:00. Usually we have 6 or 7 lessons a day. We study a lot of different subjects: Russian, English, History, Geography, Biology, Physics, Chemistry, Math, etc. I like English most of all. I usually receive good marks in these subjects. My teachers and parents think that I feel an inclination to these subjects. A school year is divided into four terms. It begins on the 1st of September known as the Day of knowledge and finishes in May. Each term is followed by holidays that last one week in autumn and spring and two weeks in winter.

My village is small, compared to the city, but very picturesque. Call it (название села). A quiet river flows through the village, which is overgrown with a comic. There are local geese bathed there, and cows graze on the shore. And then there is a piece of pristine steppe, hills and slopes. In the spring it is all florid, and in the summer the wind brings to the village the fragrant aromas of steppe herbs. Levels of green fields encounter the steppe. Here, the agricultural company and farmers grow wheat, water melons and melons, and even vegetables. To the east of the village is a small and shallow pond. It has an artificial origin. He was dug some seventy years ago. It is here that the peasants go fishing and swim, because in the river itself there are mud, comic and frogs. Our village is civilized. There are many streets in it, there are even so-called "edges". For example, that part of the village, located by the river, is called "Zhabivka". We have a gas pipeline, shops, a high school, kindergartens, a house of culture. There is also a church in the village, which is why the village from time immemorial is called a village, and not a farm. We can be reached from the district center by bus, which runs three times a day. Most peasants live in farmsteads. They plant large gardens and collect apples, cherries, cherries and pears in their own gardens. However, in the village there are even several two-story apartment houses. When I become an adult, I will definitely spend some time in the city. And then I will return to my native village, because it is better to live in nature.