Explanation
Elasticity is a measure of tendency of the body to regain its original configuration. As steel is deformed less than rubber, therefore steel is more elastic than rubber.
In a glassy solid (i.e., amorphous solid) the various bonds between the atoms or ions or molecules of a solid are not equally strong. Different bonds are broken at different temperatures. Hence there is no sharp melting point for a glassy solid.
Stress is defined as internal force (restoring force) per unit area of a body. Also, rubber is less elastic than steel, because restoring force is less for rubber than steel.
A bridge during its use undergoes alternating strains for a large number of times each day, depending upon the movement of vehicles on it when a bridge is used for long time, it losses its elastic strength. Due to which the amount of strain in the bridge for a given stress will become large and ultimately, the bridge may collapse. This may not happen, if the bridges are declared unsafe after long use.
Ivory is more elastic than wet-clay. Hence, the ball of ivory will rise to a greater height. Infact the ball of wet-clay will not rise at all, it will be somewhat flattened permanently.
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