For an object at rest on a horizontal surface, the support force must equal the object’s weight.

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Conceptual Physics 11th Edition

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Presentation transcript:

For an object at rest on a horizontal surface, the support force must equal the object’s weight.

What forces act on a book lying at rest on a table? One is the force due to gravity—the weight of the book. There must be another force acting on it to produce a net force of zero—an upward force opposite to the force of gravity. The upward force that balances the weight of an object on a surface is called the support force. A support force is often called the normal force. 2.3 Support Force

The table pushes up on the book with as much force as the downward weight of the book. 2.3 Support Force

The table supports the book with a support force—the upward force that balances the weight of an object on a surface. A support force is often called the normal force. 2.3 Support Force

The upward support force is positive and the downward weight is negative. The two forces add mathematically to zero. Another way to say the net force on the book is zero is  F = Support Force The book lying on the table compresses atoms in the table and they squeeze upward on the book. The compressed atoms produce the support force.

The upward support force is as much as the downward pull of gravity. 2.3 Support Force

The upward support force is as much as the downward pull of gravity. 2.3 Support Force

think! What is the net force on a bathroom scale when a 110-pound person stands on it? 2.3 Support Force

Answer: Zero–the scale is at rest. The scale reads the support force, not the net force. 2.3 Support Force

think! Suppose you stand on two bathroom scales with your weight evenly distributed between the two scales. What is the reading on each of the scales? What happens when you stand with more of your weight on one foot than the other? 2.3 Support Force

Answer: In the first case, the reading on each scale is half your weight. In the second case, if you lean more on one scale than the other, more than half your weight will be read on that scale but less than half on the other. The total support force adds up to your weight. 2.3 Support Force