Question

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 31 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.)

Answer 1

Answer:

The vector gravitational force is  $W = 303.8\ N( -y)$

Explanation:

From the question we are told that

      The mass of the object is  $m = 31 \ kg$

      The acceleration due to gravity experienced by the object is $g = 9.8 m/s^2$

Generally the vector gravitational force on the object is mathematically represented as

                       $W = 31 * 9.8$

                       $W = 303.8\ N (-y)$

The  -y indicates that the direction of the force is towards the center of the earth