Answer to Question #110006 in Mechanics | Relativity for anthonyamaro

Question #110006
Consider a weathered rock or soil particle lying on a slope. How will the gravitational force pulling the particle downward along the land surface vary with the inclination of the slope?
1
Expert's answer
2020-04-20T10:01:55-0400

The figure shows a weathered rock on a slope with an inclination of α\alpha to the horizon.

Gravity acts on a soil particle strictly upright, but in this direction soil particle relies on the layers below. However, if this force is decomposed into two components, one FtF_t along the slope, and the other FnF_n perpendicular to the surface of the slope, it becomes clear that it is the force along the slope that has no reaction and can cause rolling. It can be seen from the figure that FtF_t is the leg of the right triangle opposite the corner α\alpha, and FF is its hypotenuse. Thus Ft=FsinαF_t=F\cdot sin\alpha is a component of the gravitational force pulling the particle downward along the land surface. When the angle of the slope α\alpha is small, this force is small and changes proportionally FtFαF_t\simeq F\cdot \alpha . When the slope becomes large, it more and more approaches to gravitational force of the particle and almost ceases to depend on the slope.

Answer: The gravitational force pulling the particle downward along the land surface vary with the inclination of the slope as sinαsin\alpha


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