Arc-o-Bot #2

Aim: studying the relationship in a circumference between angle and subtended arc of circumference; direct proportionality.

Material:

OZOBOT

Card with Path an example is provided

In this activity students will experience the direct proportionality between angle and arc of circumference. The length will be measured as time OZOBOT takes to cover the circumference arc.

Procedure:

• STEP 1

Write a code for following a line at a defined speed.

Set a velocity and upload the code on OZOBOT.

Measure the time OZOBOT takes to cover a circumference arc, repeating the measurement in order to minimize the error.

Repeat the same procedure on other circumference arcs: take note also of the different angles.

• STEP 2

Plot the arc length vs. the angle: it has to be a straight line passing through the origin of the axes.

Extensions:

• OZOBOT’s led can flash with different colours, so the measuring of the time becomes easier.