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Explain Bot The reaction force, also known as the support force or normal force, is the force exerted by a surface to support an object or counteract the force exerted on it. In this case, when a book is pushed down on a table with a force of 25N, the reaction force is the force exerted by the table back on the book.
To better understand how to calculate the reaction force, we can apply Newton's third law of motion. According to this law, for every action, there is an equal and opposite reaction. In this scenario, the action is the force of 25N being applied by the book onto the table. The reaction force will be equal in magnitude but opposite in direction to the applied force, meaning it will act upwards, opposing the force applied by the book.
Therefore, in this case, the reaction force exerted by the table on the book will also be 25N, but directed upwards.