3.12 To measure the diameter and circumference of a round object

Natural sciences

Matter, measuring and reactions

Educator section

Memorandum

• The inside diameter is the diameter of the cylinder on the inside. So that one can determine how much contents it can take, for instance.
• The outside diameter is the diameter of the cylinder on the outside. So that one can determine how much space it will occupy.
• Circumference of the can's curved surface: Take thread and wrap it around the can. Place the thread on a ruler and measure its length.
• The circumference is 20,5 cm.
• Nail: 5 cm (estimate); 4 cm (reading)
• Measuring-cylinder: 6 cm (estimate); 5,5 cm (reading)

Leaner section

Content

Activity: to measure the diameter and circumference of a round object [lo 1.2]

The curved surface of the cylinder is known as the convex surface of the cylinder.

• Think of a strategy for measuring the circumference of the convex surface of a cylinder. Use a 340 ml cold drink can as your example.

This is how we measure the convex surface of the tin:

We first ...

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• Measure the diameters of the following objects:

Assessment

Learning Outcome 1: The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

Assessment Standard 1.2: We know this when the learner conducts investigations and collects data: organises and uses apparatus/equipment or sources to gain and record information.