physics m1 vernier caliper & micrometer

OBJECTIVESOBJECTIVES Main parts of vernier caliper

Main parts of vernier caliper

Main parts of micrometer


Choosing the right instrument Choosing the

right instrument QUIZQUIZINTRODUCTIONINTRODUCTION

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Physics Module 1 Unit 2 Lesson 4REVIEW

BEGIN







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Length is called by a different name depending on where it is measured. Some examples are:

Diameter: length across a circle

Thickness: smallest length of a rectangular blockDepth: length below the surface of the water

Width/Breadth: length of shorter side of a rectangle

The choice of instrument will depend on the following:

The size of the The size of the length to be length to be measured.measured.

The size of the The size of the length to be length to be measured.measured.

The location of the The location of the length to be length to be

measuredmeasured

The location of the The location of the length to be length to be

measuredmeasured

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When you complete this slide presentation, you will be able to:

Identify the main parts of a vernier caliper.

Read the vernier caliper accurately.

Identify the main parts of a micrometer.

Read the micrometer accurately.

Choose the right instrument for measuring length.

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PARTS OF A VERNIER CALIPERc: outside jaw of framed: outside jaw of verniere: inside jaw of framef: inside jaw of vernierg: depth probeR: main scaleW: knob for ease of movement of vernierL: lever for locking vernier in place







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STEPS1.Read off 1.8 cm on the main scale at the graduation immediately before where the zero of the vernier scale falls on the main scale2.Check along the scales and find where a graduation on the main scale and the vernier scale line up.3.Read the value of 7 units on the vernier scale.4.Add the 7 as the third digit to the main scale reading to make the vernier reading 1.87 cm

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Zero of vernier scale

Reading of 1.8 cm on main scale

Read value of 7 units on vernier scale where graduations line up







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Anvil Spindle Sleeve Thimble Ratchet

Frame

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STEPS1.Read off the value of 3.5 mm on the sleeve scale immediately before position (1) along the line where the thimble meets the sleeve2.Read off the value of 11 units on the thimble scale at position (2) where a graduation lines up with the scale line on the sleeve. 3.Add this to the sleeve reading as 0.11 mm to give 3.5 + 0.11 = 3.65 mm as the reading







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Choosing the right instrument for measuring length depends on: the magnitude of the length being measured.

The ranges of instruments used for measuring length are different. The maximum reading on the scale of the right instrument should be greater than the length being measured but not very much greaterFor example, to measure the diameter of a pencil (a small length) a metre ruler would not be chosen. A micrometer would be suitable instrument.

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Choosing the right instrument for measuring length depends on: the location of the length being measured.

The degree of difficulty in measuring some types of length, is greater with some instruments than others.

For example, a vernier caliper can measure the diameter of a tennis ball without undue difficulty compared to a tape measure.

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Are you ready to test yourself? There are five multiple choice items that you are required to

do. For each item, click on the letter of the correct response and

then click the button ‘NEXT QUESTION’ to continue.Click the BEGIN QUIZ button to start the quiz.

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BEGIN QUIZ!BEGIN QUIZ!







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Which instrument would you choose to measure the inner diameter of a ring?

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A. Ruler A. Ruler

B. Micrometer B. Micrometer

C. Tape measureC. Tape measure

D. Vernier caliperD. Vernier caliper

FEEDBACKFEEDBACKFEEDBACKFEEDBACK







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Which instrument would you choose to measure the inner diameter of an engagement ring?

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A. It would be difficult to measure the real diameter of the ring with a ruler.B The micrometer is designed to measure external diameters and not inner diameters.C. The tape measure would pose the same problem as a ruler.D. is correct. The upper jaws of the vernier caliper makes it suitable as well as its range makes measurement possible without undue difficulty.







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Which instrument would be most suitably used to measure the diameter of steel ball bearing?

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A. Tape measure A. Tape measure

D. Vernier caliper D. Vernier caliper

C. Ruler C. Ruler

B. Micrometer B. Micrometer








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Which instrument would be most suitably used to measure the diameter of a steel ball bearing?


A . tape measure is incorrect. The range of the ruler is unsuitable. Additionally, it cannot measure the cross sectional diameter of the sphere. B. micrometer is correct. A micrometer is designed to measure the external diameters of objectsC. ruler is incorrect. The range of the ruler is unsuitable. Additionally, it cannot measure the cross sectional diameter of the sphere. D. vernier caliper is incorrect. The range and design of the vernier caliper are suitable, however it is not as suitable as the screw gauge.







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Which instrument would you choose to measure the depth of one of the holes in abowling ball?

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A. Micrometer A. Micrometer

D. Ruler D. Ruler

B. Meter ruleB. Meter rule

C. Vernier caliper C. Vernier caliper








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Which instrument would you choose to measure the depth of one of the holes in a bowling ball?


A The design of the micrometer makes it impossible to probe into the hole of the bowling ballB The range of the metre ruler is unsuitable, as well as the design/thickness of the meter rule makes unsuitable.C is correct. The depth gauge of the vernier caliper can measure the depth of narrow cavities.D The range is suitable, but the thickness of the ruler makes it unsuitable.







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The illustration shows the scale of a vernier caliper which is used to measure the diameter of a ring. What is the diameter of the ring?

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A. 1.43 cmA. 1.43 cm

D. 1.5o cmD. 1.5o cm

C. 2.15 cmC. 2.15 cm

B. 1.23 cmB. 1.23 cm








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A is incorrect. The main scale reading immediately below the zero of the vernier scale is 1.2 cmB is correct. The main scale reading of the graduation immediately before the zero of the vernier scale is 1.2 cm and the graduations align at 3 units on the vernier scale. The diameter is therefore 1.23 cmC is incorrect. The main scale reading of the graduation immediately before the zero of the vernier scale is 1.2 cmD is incorrect. The main scale reading of the graduation immediately before the zero of the vernier scale is 1.2 cm

The illustration shows the scale of a vernier caliper which is used to measure the diameter of a ring. What is the diameter of the ring?







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What is the thickness of a metal plate which the micrometer in the illustration is used to measure?

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B. 4.46 mmB. 4.46 mm

D. 5.00 mm D. 5.00 mm

C. 3.99 mmC. 3.99 mm

A. 4.44 mm A. 4.44 mm








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What is the thickness of a metal plate which the micrometer in the illustration is used to measure?

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A is correct. The reading of the graduation on the sleeve immediately before the line along where the thimble meets the sleeve is 4.00 mm. The scale line coincides with 44 units on the thimble scale. The thickness of the plate is 4.00 + 0.44 = 4.44 mm

B is incorrect. The scale line coincides with 44 units on the thimble scale and not 46 units

C is incorrect. The reading of the graduation on the sleeve immediately before the line along where the thimble meets the sleeve is 4.00 mm

D is incorrect. The reading of the graduation on the sleeve immediately before the line along where the thimble meets the sleeve is 4.00 mm

END OF QUIZ END OF QUIZ END OF QUIZ END OF QUIZ







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Instructions: The right column features the names of instruments. The left

column is a list of parts of instruments. Match the part in the left column to the correct instrument in

the right column by typing your response in the box on the left. You must be in Slide Show to type in the box.

Click the CHECK button for feedback.

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BEGIN ACTIVITY!BEGIN ACTIVITY!







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Match the parts in the left column to the correct instrument in the right column by typing the name of the instrument in the box on the left. You must be in Slide Show to type in the box.

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Micrometer

Part Instrument

Vernier caliper

Vernier caliper

Micrometer

CHECKCHECK

CHECKCHECK

CHECKCHECK

CHECKCHECK

Micrometer

Vernier caliper

Vernier caliper

Micrometer







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1. Main sleeve is a part of the micrometer

2. Depth gauge is a part of the vernier caliper

3. Upper and lower jaws belong to the vernier caliper

4. Thimble is a part of the micrometer







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You have reached the end of the activity. If you wish to review other concepts in this lesson, click on any

of the topics in the main menu above. If you have finished viewing the lesson, click the Close (X)

button.

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physics m1 vernier caliper & micrometer

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