CHAPTER 25 – MEASUREMENTS


FIGURE IT OUT! 1. A hockey pitch has sides of 91.4 m and 55 m.


a. What instrument would you use to measure this accurately?


b. What length would the perimeter (all the exterior sides added together) be?


2. Measure the length of your science copy page and give the dimensions in:


a. millimetres b. centimetres c. metres


? : Fig. 25.8


TEST TUBE


6. Look around your classroom and list all the measuring instruments you can see. Identify what each one is used to measure.


7. Which measuring instruments would be used to measure: a. the thickness of a textbook b. the width of a pen


c. the height of a person d. the distance between lampposts?


EXPERIMENTAL INVESTIGATION 25.2 How can we measure the length of a curved line?


Equipment Pen Paper/map Opisometer Ruler


Method


1. You can measure the length of a curved hand- drawn line or a curved line on a map, e.g. a road or river.


2. Mark the start and end of the line you are going to measure.


3. Make sure the opisometer has its wheel all the way over to one side, beside the pointer end, with the pointer over the start of the line.


: Fig. 25.9 To measure the length of a curved line


4. Carefully roll the opisometer along the line, making sure the wheel is turning, until the pointer has reached the end.


5. As soon as you have measured the line, place the opisometer on the ruler at the zero point and roll it the other way until the wheel is back at the pointer end.


6. The length it moves along the ruler shows the length of the curved line. j Go to page 70 of your Experimental Investigations Log to write up this investigation. Elements of Science 241


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