Module 6
PlanningGuide

Lab 2.8

Lesson 2.5
Lesson 2.6
Lesson 2.7
Lesson 2.8
Lab 2.5
Lab 2.6
Lab 2.7
Lab 2.8
Project 6

Physics Lab 2.8 Vernier

Overview
The purpose of this laboratory class is to demonstrate the use of a Vernier scale in obtaining an accurate estimate of the fraction of a graduation when the length of an object is measured.

Activity2.8.1 Make a model of a Vernier scale

Materials
Cardboard
Ruler

Procedure:

1. Cut the cardboard to make two pieces that are roughly 28 cm long and 10 cm wide.
2. Starting at the corner of the card, create a main scale by placing marks 1 cm apart along the longer edge of the card.
3. Create a Vernier scale on the second piece of card. Starting at the other end of the card, place a series of 10 marks that are each 0.9 cm apart. The combined length of the 10 graduations on the Vernier scale should be equal in length to 9 of the graduations on the main scale.
4. Hold the two edges together as shown in the diagram below.
5. Move the Vernier scale away from the common edge of the two scales.
6. Notice how each graduation on the Vernier scale lines up in turn with one of the graduations on the main scale.

Questions

What are the measurements indicated on the Vernier scales below?

Answers

1. 3.7
2. 6.4 (possibly 6.42 since the mark is just past the 4 but closer to the 4 than to the 5)