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--- book:chap1:1.1_basic_notions_of_mechanics [2022/04/01 19:28] – jv
+++ book:chap1:1.1_basic_notions_of_mechanics [2024/10/26 12:19] (current) – jv
@@ Line 44: / Line 44: @@
 <WRAP box round>**Example 1.1** <wrap hi>A piece of chalk</wrap> \\
-We wish to follow the trajectory of a piece of chalk through the lecture hall.
+We wish to follow the trajectory of a piece of chalk through the lecture hall (i.e., when it is thrown, **not** when somebody is using it to write on a blackboard).
 In order to follow its position and orientation in space, we //decide// to model it
 as a set of two masses that are localized at the tip and at the tail of the chalk.