1. Hazrin Shah Bin Hj Azahari 08B0912 Mohammad Dedyardie Takong 08B0904 PHYSICAL QUANTITIES & UNITS

2. 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 & external length MICROMETER 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 LENGTH

3. OBJECTIVES Use and describe how to use vernier scale and calipers Use and describe how to use micrometer screwgauge

4. VERNIER CALIPER Outside jaw Inside jaw Locking nut Vernier scale Roller Main scale Tail

5. TYPES OF VERNIER CALIPER 1.Basic vernier caliper 2. Long Jaw vernier caliper

6. TYPES OF VERNIER CALIPER 3. Knife Edge vernier caliper 4. Chiesel Shape vernier caliper

7. VERNIER CALIPER 1.Vernier caliper is used to measure the: a) the external diameter of an object b) the internal diameter of an object c) depth of a tube 2. It is used to measure length to the nearest 0.01 cm or 0.1 mm

8. SCALES IN A VERNIER CALIPER Main scaleVernier scale

9. HOW TO USE A VERNIER CALIPER 1. Slide the vernier scale along the main scale so that an object can be inserted into the jaws (inside or outside jaw)

10. HOW TO USE A VERNIER CALIPER 2. Read the main scale up to the zero line of the vernier scale

11. HOW TO USE A VERNIER CALIPER 3. Read the vernier scale by looking for the line in the vernier scale which is exactly opposite any line in the main scale http://members.shaw.ca/r on.blond/Vern.APPLET/