Mary Pushes Horizontally on a Large, Heavy Table Which Is

question 64

Multiple Choice

Mary pushes horizontally on a large, heavy table which is standing alone in the middle of a room, and notes that the table does not move despite the fact that she is pushing on it (see the figure) . Why doesn't the table move?

• A) Very massive objects, such as the table, are difficult to set into motion because of their large inertia.
• B) The table pushes back on Mary with a force that is even larger than Mary's pushing force.
• C) The force of gravity pulls downward on the table, and this force cancels the pushing force.
• D) A frictional force is also exerted by the floor on the table, and this force is equal and opposite to the pushing force.
• E) The table exerts a force on Mary, and this force is equal and opposite to the pushing force.

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