Physics for IGCSE & O level - Forces And Motion (Section 7 - No. 47)
What is the action force when a book sits on a table?
The table's normal force on the book.
The Earth's gravity acting on the book.
The book's weight.
The book's force on the table.
คำอธิบาย
According to Newton's Third Law, it is the book's force on the table.