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Accurate Length Measurement
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Accurate Length Measurement
Mei is checking equipment for a coastal restoration project. Choose suitable measuring tools, record lengths carefully, and explain how to make measurements more reliable. Show working where asked; include units in every measurement.
Choose and read carefully
1.Mei needs to measure a 24 cm plant marker to the nearest millimetre. Which tool is the best choice, and why?
- A 30 cm ruler with millimetre divisions, because it covers the marker and has suitable resolution
- A metre stick marked only in centimetres, because it is longer
- A kitchen scale, because it gives a precise reading
- A flexible tape marked only every 5 cm, because it can bend
2.The end of a seedling tray is too far from the start to measure with one 30 cm ruler placement. Describe a reliable way to measure its length using that ruler.
3.True or false: If an object starts at the 1.0 cm mark and ends at 18.6 cm, its length is 18.6 cm.
TrueFalse
4.Mei reads a ruler while looking from above and to one side. Name the reading error this can cause and state how to reduce it.
Use the field measurements
Mei measures the same wooden stake three times, repositioning the tape each time.
Trial
Length (cm)
1
41.2
2
41.4
3
41.3
5.Calculate the mean of the three stake measurements in the table. Give your answer to the nearest 0.1 cm.
6.The three readings in the table are close together. What does this suggest about their precision? Does it prove that the mean is accurate? Explain briefly.
7.Convert the mean stake length, 41.3 cm, to millimetres. Show the conversion.
8.A tape measure has 1 mm divisions. What is the smallest division it can show in centimetres?
- 0.01 cm
- 0.1 cm
- 1 cm
- 10 cm
9.Before recording a long tray measurement, Mei checks that the tape is straight, starts at zero, and lies along the tray rather than sagging. Explain why any two of these checks matter.
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