Three forces act on a box on an inclined plane as shown in the diagram below. [vectors
are not drawn to scale]
if the box is at rest, the net force acting on it is equal to
-the weight
-the normal force
-friction
-zero

zero

Explanation:

For the box remaining at rest, the total acceleration on the box must be zero. Since force F = m*a, the force F must also be zero.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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