1. Hazrin Shah Bin Hj Azahari 08B0912 Mohammad Dedyardie Takong 08B0904 LENGTH

2. OBJECTIVES:  Identify rules, meter rule, micrometer screw gauge, vernier calipers and measuring tape.  Use and describe how to use ruler, micrometers, vernier scales and calipers to determine length.  Specify correct units for shorter and longer lengths.

3. LENGTH INSTRUMENTSUNITS

4. metrecentimetrekilometre millimetre UNITS OF LENGTH

5. INSTRUMENTS Ruler Measuring tape Vernier caliper caliper Micrometer screw gauge

6. Vernier calipers What is it used for? To measure the external and internal diameter of object Example: External and internal diameter of a beaker http://members.shaw.ca/ro n.blond/Vern.APPLET/

7. Micrometer screw gauge What is it used for? To measure very small value to the nearest 0.01 mm Example: the thickness of a paper http://members.shaw.ca/ro n.blond/Micrometer.APPLET /

8. Length Units commonly used 1.metre 2.Centimetre 3.Millimetre 4.Kilometre Instruments used 1.Metre rule 2.Measuring tape 3.Vernier caliper 4.Micrometre screw gauge Ruler Example : Width of a book Measuring tape Example : Length of a door Vernier calipers Example : To measure the internal length & external length Micrometre screw gauge Example : To find the thickness of a paper Use to measure short length Use to measure longer length Use to measure the internal and external diameter of object Use to measure very small value