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INTRODUCTION TO PHYSICS

1.4 UNDERSTANDING MEASUREMENTS. INTRODUCTION TO PHYSICS. Determination of the actual value for particular physical quantity. MEASUREMENT. C onsistency. Ability of a measuring instrument to give readings with very small deviation or no deviation from the mean value.

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INTRODUCTION TO PHYSICS

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  1. 1.4 UNDERSTANDING MEASUREMENTS INTRODUCTION TO PHYSICS

  2. Determination of the actual value for particular physical quantity. MEASUREMENT

  3. Consistency • Ability of a measuring instrument to give readings with very small deviation or no deviation from the mean value. • Consistency of a measuring instrument can be improved by: • Taking a reading with caution • Eliminating parallax errors • Using the instrument which is not defective

  4. Example • Mean value group A = 13.97s • Mean value group B = 14.30s

  5. Accuracy • Ability of a measuring instrument to give readings nearest or almost equal to the actual value • Accuracy of a measurement can be improved by; • Repeating the measurement • Avoiding zero errors • Avoiding parallax errors • Using the measuring instrument with a higher sensitivity

  6. Ability of a measuring instrument to detect a very small changes in the quantity being measured. Sensitivity

  7. 2 main types of errors • Systematic errors • Random errors Type of experimental errors

  8. Systematic error : Zero error Is the error in an instrument that does not show zero reading when it should show zero reading (when not measuring any quantities)

  9. Random error : Parallax error

  10. Measuring Instruments

  11. VernierCalliper • Measure length with an accuracy of up to +0.1mm (0.01cm)

  12. ZERO ERROR

  13. Example

  14. To measure the thickness or diameter of small objects. Micrometer Screw Gauge

  15. The PART of Micrometer Screw Gauge AND ITS FUNCTION

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