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--- 183_notes:system_choice [2014/10/29 22:04] – pwirving
+++ 183_notes:system_choice [2018/05/29 21:46] – hallstein
@@ Line 1: / Line 1: @@
+Section 7.7, 7.8 and 7.9 in Matter and Interactions (4th edition)
 ===== Choosing a System Matters =====
@@ Line 25: / Line 27: @@
 === System 2: Box only ===
-Because the system is only a single particle, there's can be no potential energy. There is work done by both the person and the Earth, but they have opposite signs because the applied force and the gravitational force are in different directions.
+Because the system is only a single particle, there can be no potential energy. There is work done by both the person and the Earth, but they have opposite signs because the applied force and the gravitational force are in different directions.
   * System: Box; Surroundings: Earth and Person