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Water Rockets: First Derivatives Building and Using Clinometers Clinometers are instruments that measure the height of objects. The instructions below will explain how to build and use one. PROTRACTOR Building you clinometer: 1. Items you will need: ruler or straw, protractor, thin string (thread or fishing line), a small weight. STRAW OR RULER 2. The straw and protractor will be perpendicular to each other. Put the string through the hole and the zero degree point on the protractor and tie it off or tape it to the protractor. 3. Tape or glue the protractor to the straw (or ruler). If you plan on using the rulers and protractors again as separate tools, use tape instead of glue. 4. Attach weight to end of string. STRING WITH WEIGHT ATTACHED Using your clinometer: 1. Stand far enough away from the object you are measuring so you can easily see the top of it. 2. Looking through the straw or down the ruler, point the clinometer at the top of the object. As you move the clinometer up, the string and weight will start to move down the protractor. 3. When the clinometer is lined up with the top of the object, use your other hand to grab the string so that it stays where it is along the clinometer and read the angle that the string is lying against or, have another person read the angle that the string is lined up with. 4. Measure how far you are from the object you are measuring. 5. You can use trigonometry to figure out how high the object is: tan height distance from object Water Rocket: Clinometers Height of object = height of you + height of object from previous equation Teacher Notes © 2004 The University of Texas at Austin and the GE Foundation Page 1 of 1