CLASS 5 · LEARNING KNOWLEDGE

Observing, measuring, and units – Basics of physics

How it works

In physics, accurate observing and measuring of quantities such as length, time, mass, volume, or temperature is fundamental. For this purpose, internationally agreed units are used, for example meter (m) for length, second (s) for time, and kilogram (kg) for mass. For volume, liter (l) is often used in everyday life, and in physics also cubic meter (m³). Measuring instruments must be used correctly, and measurements must be read carefully. Measurement errors can arise, for example, from inaccurate instruments or from reading errors. Uniform standards make comparisons and calculations easier.

Note
Physical quantities are measured with standardized units. When measuring, the correct use of measuring instruments and accurate reading must be observed in order to avoid measurement errors.

An example

Which measuring instrument is used to determine the length of a pencil?

A ruler is well suited for this, because the length of a pencil can be read directly in centimeters or millimeters. A thermometer measures temperature, a scale measures mass, and a clock measures time. Therefore, the ruler is the appropriate measuring instrument here.

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Own explanation and own practice exercises by AmyMath. Subject reference framework: Physics. The topic assignment may vary by federal state.