please help me understand how to get the correct answer so I can study it for my

Question

please help me understand how to get the correct answer so I can study it for my test

2. What is the reaction force to the weight of a book sitting on a table? a) The force exerted on the table by the bookThe force exerted on Earth by the table c) The force exerted on the table by Earth book by the table e) none of the above FM d) The force exerted on the 3. What is the net force on a 5 N book at rest if an object of weight 20 N is placed on top of it? a) 5 N ·25 N b) 15 N c) 20 N e) none of these

Explanation / Answer

Since the book is sitting on the table, the book is exerting a force(ACTION) on the table ( by virtue of its weight ), in return the table is exerting equal and opposite force(REACTION) on the book. Acording to the Newton's third law.

Hence, (D) is the correct option.

In the second question it is given that the book is at rest. So, no matter how much weight you put on the book, the NET FORCE will be ZERO. Hence, (E) option.

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