CREATED BY Farisa Himatin Nihayati 053184229 OBJECTIVES SUBJECT

CREATED BY: Farisa Himatin Nihayati (053184229)

OBJECTIVES SUBJECT EVALUATION CLOSURE

q OBJECTIVES Measuring the length physical quantities

Measurement is an activity to compare a quanity with another quantity that is assigned as unit. To measure the quantity of length, we can use a vernier caliper. Vernier caliper is an instrument to measure length which is more accurate than a ruler, since it has the smallest scale of 0, 1 mm.

CONSIST OF A VERNIER CALIPER

HOW TO READ THE SCALE OF A VERNIER CALIPER? q The reading of the main scale that coincides with the zero vernier scale is between 3 mm and 4 mm. q The vernier scale that is joint vertically with the main scale is the seventh scale. Thus, the reading of the vernier caliper is (3 mm + 0, 7 mm) = 3, 7 mm

CONSIST OF A MICROMETER SCREW GAUGE

HOW TO READ THE SCALE OF A MICROMETER SCREW GAUGE? q The reading of the main scale that coincides with the edge of the outer wrap is 7, 5 mm. q The outer wrap line which coincides exactly with the horizontal line of the main schale is 38 -th line. Thus, the reading of the micrometer screw gauge is (7, 5 mm + 38 part) = 7, 5 mm + 0, 38 mm = 7, 88 mm.

WORKSHEET Objectives : Doing measurement of length, outer diameter, and width by vernier caliper and micrometer screw gauge Materials : - Cubes - Cylinders - Vernier caliper - Micrometer screw gauge Experiment methods : • Measure length, and width of cubes by vernier caliper micrometer screw gauge • Measure length and outer diameter of cylinder by vernier caliper and micrometer screw gauge

EVALUATION v. What is measurement? v. What is an instrument to measure the length? v Why a micrometer screw gauge more accurate than a vernier caliper? v. What is the reading of the vernier scale shown below!

EVALUATION v. A ring is measured by a vernier caliper. What is the diameter of the ring as read in the scale?

EVALUATION v The following figure illustrates a micrometer screw gauge. What is reading shown?

EVALUATION v. A student uses a micrometer screw gauge to measure the diameter of a cylinder. The following figure shows the reading of the micrometer screw gauge. What is the reading shown?

CONCLUSION q Measurement is an activity to compare a quanity with another quantity that is assigned as unit. To measure the quantity of length, we can use a vernier caliper. q The vernier consists of a main scale engraved on a fixed jaw and an vernier scale engraved on a movable/sliding jaw q The steps of reading the scale of a vernier caliper are: ü Read the main scale that coincides with the zero vernier scale ü Read the vernier scale that is joint vertically with the main scale.

CONCLUSION q The micrometer screw gauge consists of thimble/outer wrap, sliding jaw, sleeve with main scale. q The steps of reading the scale of a vernier caliper are: ü Read the main scale that coincides with the edge of the outer wrap ü Read the outer wrap line which coincides exactly with the horizontal line of the main scale.