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Estimates and Measurements Physical Science 2012 "Trabajar en Ciencias 7", by Santillana.

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Presentation on theme: "Estimates and Measurements Physical Science 2012 "Trabajar en Ciencias 7", by Santillana."— Presentation transcript:

1 Estimates and Measurements Physical Science 2012 "Trabajar en Ciencias 7", by Santillana.

2 Which figure is longer? "Trabajar en Ciencias 7", by Santillana.

3 Which orange circle is larger? "Trabajar en Ciencias 7", by Santillana.

4 Which blue line is straighter? "Trabajar en Ciencias 7", by Santillana.

5 What do you see? "Trabajar en Ciencias 7", by Santillana.

6 A vase with flowers? Or the profile of two faces? "Trabajar en Ciencias 7", by Santillana.

7 Physical magnitudes A magnitude is a physical property that can be measured. Examples are length, mass and temperature. Is the taste of an ice cream a physical magnitude? No, because it cannot be measured. A fundamental magnitude is independent of any other magnitud: time, mass, length. A derived magnitude is based on two or more other magnitudes: density, speed. "Trabajar en Ciencias 7", by Santillana.

8 What do you see? Old or young? "Trabajar en Ciencias 7", by Santillana.

9 Measurements A measurement is the comparison of a physical magnitude with a fix quantity. The result of a measurement is a number and a unit. When you compare yourself to a meter, you measure your height, which may be 1,5 m. Some measurements are inexact, like a teaspoon of sugar in a recipe. Others are exact: a meter always measures the same. "Trabajar en Ciencias 7", by Santillana.

10 Old or young? "Trabajar en Ciencias 7", by Santillana.

11 Estimates An estimate is to assign a value to a physical magnitude without using a measuring device/tool. It is based on perception and the experience of who is making the estimate. If you feel bad you may estimate that you have a fever, but your mother might estimate that your temperature is normal. Instead of estimating, you can actually measure it with a thermometer. "Trabajar en Ciencias 7", by Santillana.

12 Practice Explain what is the difference between a fundamental physical quantity and a derived physical quantity. Underline the characteristic that is a physical magnitude: color, beauty, speed, taste, volume, temperature. Explain why the following information is a measurement: length of a table is 78 cm "Trabajar en Ciencias 7", by Santillana.

13 A sax? "Trabajar en Ciencias 7", by Santillana.

14 Practice – Estimates and Measurements Measure the height of your notebook with an inexact method, like assuming each finger is 1 cm. Then use a ruler. Procedure: Estimate the time it takes to perform each task, and then measure it with an appropriate device: "Trabajar en Ciencias 7", by Santillana. ActionEstimated timeMeasured time To sing “happy birthday” To walk around the classroom


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