Questions and Answers
What is the conversion factor for kilometers to meters?
A parallax error occurs due to the correct positioning of the eye while measuring.
False
How do you measure the length of a curved line?
Use a thread to follow the curve and then measure the straightened thread with a ruler.
To convert 6500 meters to decimeters, use the conversion of 1 meter = ______ decimeters.
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Match the following types of measurements to their correct conversions:
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Which of the following describes periodic motion?
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To measure a length with a broken ruler, you only need one reading from the scale.
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What is the length in kilometers for a measurement of 6500 meters?
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The correct eye position for accurate measurement is indicated by point ______ in the parallax error diagram.
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What is the total length of 245.7 kilometers converted to centimeters?
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Study Notes
Need for Adopting SI Units of Measurement
- Early measurement methods relied on body parts, leading to inconsistencies due to size variations among individuals.
- French developed the Système International d’unités (SI) to ensure uniformity in measurement globally.
- The SI system comprises seven base units from which derived units can be formed.
Some SI Units
- Length: Metre (m)
- Mass: Kilogram (kg)
- Time: Second (s)
- Temperature: Kelvin (K)
- Electric Current: Ampere (A)
Advantages of Using SI Units
- Promotes uniformity in measurements worldwide, reducing confusion across different regions.
- Enhances reliability and accuracy in measurements.
Key Conversion Facts
- 1 kilometre (km) = 1000 metres (m)
- 1 metre = 10 decimetres (dm)
- 1 metre = 100 centimetres (cm)
- 1 metre = 1000 millimetres (mm)
Measurement Concepts
- Measurement involves comparing an unknown quantity with a known unit.
- The result consists of two parts: magnitude (number) and unit.
- Example: 1 minute = 60 seconds, where 60 is the magnitude and seconds is the unit.
- Importance of including units for clarity in answers; lack of units leads to misinterpretation.
Ancient Units of Measuring Distance
- Hand Span: Distance from thumb tip to little finger tip.
- Cubit: Distance from middle finger tip to elbow bottom.
- Yard: Distance from chin to middle finger tip.
- Pace: Length of one step when walking.
- Foot: Length of an average human foot.
Parallax Error
- A measurement error caused by improper eye positioning while reading scales.
- Correct eye position is essential for accurate measurement; misalignment can lead to incorrect reading.
Measuring a Curved Line
- Use a thread and a ruler:
- Knot one end of the thread and align it with the curve.
- Measure small straight sections successively.
- Mark knots at both ends of the measured sections.
- Straighten the thread and measure the distance between knots with a ruler.
Measuring with a Broken Ruler
- Measure the available reading on a broken ruler.
- Record the readings at both ends of the object.
- Subtract the smaller reading from the larger to determine the object’s actual length.
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Description
Explore the importance of adopting SI units of measurement and how it has standardized measurements across different regions. This quiz delves into the history and benefits of the Système International d’unités, emphasizing the need for uniformity in measurements to avoid confusion. Assess your understanding and learn about the evolution of measurement systems worldwide.
