A 1.0 kilogram mass is resting on the ground. A person is standing above the mass and pulling up on a rope tied to the top of it, but the pulling force is not enough to lift the mass from the ground. How does pulling on the rope affect the normal force that the ground applies to the mass?Select one:It may increase or decrease the normal force; there is not enough information to say for certain.highlight_offIt increases the normal force.highlight_offIt does not change the normal force.highlight_offIt decreases the normal force.highlight_off
Question
A 1.0 kilogram mass is resting on the ground. A person is standing above the mass and pulling up on a rope tied to the top of it, but the pulling force is not enough to lift the mass from the ground. How does pulling on the rope affect the normal force that the ground applies to the mass?Select one:It may increase or decrease the normal force; there is not enough information to say for certain.highlight_offIt increases the normal force.highlight_offIt does not change the normal force.highlight_offIt decreases the normal force.highlight_off
Solution
It decreases the normal force.
Here's why: The normal force is the force exerted by a surface that supports the weight of an object resting on it. It acts perpendicular (or "normal") to the surface. The normal force is equal to the weight of the object, but in the opposite direction.
When the person pulls up on the rope, they are applying an upward force on the mass. This reduces the force that the mass applies to the ground because some of the mass's weight is now being supported by the tension in the rope. As a result, the ground doesn't need to push up as hard to support the mass, so the normal force that the ground applies to the mass decreases.
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