Question

multiple choice question
identify the items in the system and in the external world for the situation shown.
system: book; external world: table, hand, earth
system: book, hand; external world: table, earth
system: book, hand, table; external world: earth
system: table, book; external world: hand, earth
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Explanation:

• In physics, when defining a system, we look at the objects of interest. Here, the hand, book, and table are in direct interaction (hand on book on table).
• The Earth is an external object as it exerts a gravitational force (weight) on the system (book - hand - table) from outside the defined group of interacting objects.

Answer:

system: book, hand, table; external world: Earth