A-LevelPhysicsDynamics9702/12 · May/June 2017 · Q91 Mark
A book of weight W is at rest on a table. A student attempts to state Newton's third law of motion by saying that 'action equals reaction'. [Diagram shows a book resting on a table, with an arrow labelled W pointing downwards from the book.] If the weight of the book is the 'action' force, what is the 'reaction' force?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Athe force W acting downwards on the Earth from the table
Bthe force W acting upwards on the book from the table
Cthe force W acting upwards on the Earth from the book
Dthe force W acting upwards on the table from the floor
✓ Correct answer
C: the force W acting upwards on the Earth from the book
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