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In our usual coordinate system( +x to the right, +y up (away from the center of the Earth), +z out of the page toward you), what is the vector gravitational force on a 22 kg object sitting on the ground? (From the momentum principle you can conclude that a force of the same magnitude is exerted upward by the ground on the object if the momentum isn't changing. In Chapter 4 we'll see more about the origin of this force.)F--> grav = ______ N

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Answer:

Fgrav = -216 N j

Explanation:

The gravitational force that the mass of the Earth exerts on any mass on its surface, obeys the Newton´s Universal Law of Gravitation, which says that two masses attracts each other with a force that is directed along a line joining both masses.

As the force exerted by the Earth is attractive, is directed towards the center of the Earth, i.e., is directed vertically downward.

If we choose the +y axis to be up (away from the center of the Earth), the vector graviational force will be negative, as follows:

Fg = 22 kg* 9.8 m/s² = -216 N j

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