1 / 19

Measuring Length

Chapter 2. Measuring Length. - Introduction to instruments and units used. Introduction. 1. Observation is a science process skill used in investigations. 2. Observations. Qualitative Quantitative. 3 . Qualitative observations. -5 senses - descriptions e.g. It is smooth.

Download Presentation

Measuring Length

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chapter 2 Measuring Length - Introduction to instruments and units used

  2. Introduction 1. Observation is a science process skill used in investigations 2. Observations • Qualitative • Quantitative 3. Qualitative observations -5senses -descriptions e.g. It is smooth. The gas is pungent and colourless. It is moving quickly. 4.Quantitative observation -accurate measurements using instruments e.g metre rule, measuring tape, vernier calipers, measuring cylinder, pipette, burette, electronic balance, spring balance

  3. Physical Quantities 1. A physical quantity is a quantity which can be measured. e.g. length, area, volume, time, temperature, mass 2. A non-physical quantity is one which cannot be measured. e.g beauty, kindness, humour, sadness, untidiness

  4. Exploring Science 1-CDIS

  5. Physical Quantity SI Unit Symbol SI Unit length metrem time second s kilogram kg mass newton N weight

  6. Measuring Length SI unit: metre (m) millimetre (mm) andcentimetre (cm) Smaller units: 1 m = 100 cm 1 m = 1000 mm 1100 11000 1 cm = m 1 mm = m =0.01 m 1 cm = _____ mm 10

  7. Instruments for Length -metre rule and measuring tape -accuracy of 0.1 cm (1 mm)

  8. Instruments for Length External Caliper - accuracy of 0.1 cm Internal Caliper - accuracy of 0.1 cm

  9. External Calipers Measuring the external diameter of a beaker

  10. External Calipers Measuring the external diameter of a beaker

  11. Internal Calipers Measuring the internal diameter of a beaker

  12. Internal Calipers Measuring the internal diameter of a beaker

  13. Vernier Calipers -for measuring short lengths -accuracy of 0.01 cm or 0.1mm

  14. Physics - A Course for ‘O’ Level Federal

  15. Physics - A Course for ‘O’ Level Federal

  16. Parallax Error is an error in a measurement due to the eye not being in the correct position when taking a reading. For accurate measurements using the metre rule or measuring tape, the eye must be placed vertically above the mark being read to prevent parallax error.

  17. Micrometer Screw Gauge - accuracy of 0.001 cm

  18. Micrometer Screw Gauge anvil sleeve thimble ratchet spindle frame

  19. When using a ruler, parallax errors can be avoided by - placing the eye vertically above the marking on the scale to be read. - placing a thick ruler on its edge beside the object to be measured so that the scale is touching it - using a thin ruler so that the scale is touching the object to be measured

More Related