Question

why solid is ragid plzzz answer the question

Answer 1

Solids are rigid because there particles are closely packed to each other.....


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Answer 2

A number of experiments have shown that actual wheel performance in soil is not what would be expected from existing wheel theories which are based on the plate sinkage analogy. In order to reach a better understanding of the soil-wheel problem it is necessary to investigate the actual interaction between wheels and soil. In this paper, investigations into the flow patterns of soil, the complete trajectories of soil particles and the soil deformations beneath wheels are described. It is shown that a conventional vehicle wheel displaces soil partly sideways and partly longitudinally. Even beneath a rather narrow wheel, soil does exhibit longitudinal flow phenomena. There are normally two flow zones in the longitudinal plane, one forward and one backward. These degenerate into a single backward zone at 100% slip and a single forward zone for a locked wheel. The characteristics of the flow patterns and the trajectories of soil particles show that the behaviour of soil beneath a moving wheel conforms to the basic principles of soil mechanics.

It is shown that the basic assumption underlying existing wheel theories is inadequate in that the soil does not flow in a manner akin to that beneath a plate. A sound theoretical basis for the prediction of wheel performance should be, therefore, established on the basis of knowledge of actual soil flow beneath wheels.