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Which exerts a greater force on a table:

A 1.70-kg physics book lying flat on the table, or a 1.70-kg physics book standing on end on the table?

Answer :

Neither book exerts a greater force on the table. Both the book lying flat and the book standing on end exert the same force, which is their weight.

Here's why:

The force exerted by an object on a surface is its weight, which is the product of its mass and the gravitational acceleration. In this case, both books have the same mass (1.70 kg), and the gravitational acceleration is assumed to be constant.

The position of the book doesn't affect its weight. Whether the book is lying flat or standing on end, the force it exerts on the table is simply its mass multiplied by gravity.

While the pressure exerted by the book on the table might differ due to the different contact areas created by its positioning, the overall force remains the same.

Therefore, both the book lying flat and the book standing on end exert a force of 1.70 kg * gravity on the table. The position of the book only affects the distribution of pressure, not the total force.

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Rewritten by : Jeany