1.1.1

Measuring Length

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Measuring Length

We normally measure length using a ruler.

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Method

  • When using a ruler, it is important to line up the object with the start of the divisions on the ruler.
  • To avoid parallax errors (when your eyes and the scale are not lined up), we should read the ruler at right angles.
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Measuring very small lengths 1

  • A ruler is not suitable for measuring very small lengths, such as the thickness of a sheet of paper.
  • To work out the thickness of one sheet of paper, we can stack together lots of sheets so that the total thickness of the stack can be accurately measured with a ruler.
  • The average thickness of one sheet of paper is the total thickness of the stack divided by the number of sheets in the stack.

Jump to other topics

1Motion, Forces & Energy

1.1Physical Quantities & Measurement Techniques

1.2Motion

1.3Mass & Weight

1.4Density

1.5Forces: Effects of Forces

1.6Forces: Turning Effects of Forces

1.7Forces: Centre of Gravity

1.8Momentum

1.9Energy, Work, & Power: Energy

1.10Energy, Work & Power: Work

1.11Energy, Work & Power: Energy Resources

1.12Energy, Work & Power: Power

1.13Pressure

2Thermal Physics

3Waves

4Electricity & Magnetism

4.1Simple Phenomena of Magnetism

4.2Electrical Quantities: Electric Charge

4.3Electrical Quantities: Electric Current

4.4Electromotive Force & Potential Difference

4.5Electrical Quantities: Resistance

4.6Electrical Energy & Electrical Power

4.7Electric Circuits: Circuit Diagrams & Components

4.8Electric Circuits: Series & Parallel Circuits

4.9Electric Circuits: Action & Use

4.10Electrical Safety

4.11Electromagnetic Effects: Electromagnetic Induction

4.12Electromagnetic Effects: The A.C. Generator

4.13Magnetic Effect of a Current

4.14Force on a Current-Carrying Conductor

4.15Electromagnetic Effects: The D.C. Motor

4.16Electromagnetic Effects: The Transformer

5Nuclear Physics

6Space Physics

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