Hazrin Shah Bin Hj Azahari 08B0912Mohammad Dedyardie Takong 08B0904

PHYSICAL QUANTITIES & UNITS

Units commonly used

1. metre2. centimetre3. millimetre4. kilometre

Instruments used

1. Metre rule2. Measuring tape3. Vernier caliper4. Micrometre

screw gauge

RULERExample : 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

OBJECTIVES

• Use and describe how to use vernier scale and calipers

• Use and describe how to use micrometer screwgauge

VERNIER CALIPER

Outside jaw

Inside jaw

Locking nut

Vernierscale

Roller

Main scaleTail

TYPES OF VERNIER CALIPER

1. Basic vernier caliper

2. Long Jaw vernier caliper

TYPES OF VERNIER CALIPER

3. Knife Edge vernier caliper

4. Chiesel Shape vernier caliper

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

SCALES IN A VERNIER CALIPER

Main scale Vernier scale

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)

HOW TO USE A VERNIER CALIPER

2. Read the main scale up to the zero line of the vernier scale

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/ron.blond/Vern.APPLET/