A body is said to be perfectly plastic ifa)it does not recover its ori...
A body is said to be plastic when its coefficient of restitution or reformation is zero that means that whatever hits it loses its all kinetic energy once the body gets deformed does not reform.
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A body is said to be perfectly plastic ifa)it does not recover its ori...
For any question of elasticity we have to consider the state when the deforming force is removed .....in this case only ans A suggests such kind of statement......and we know that for a plastic body it will not try to regain it's original configuration when the force is removed .......so this is the ans
A body is said to be perfectly plastic ifa)it does not recover its ori...
A perfectly plastic body refers to a material that does not recover its original shape or size when the deforming force is removed. This means that once the body is deformed, it remains permanently deformed and does not return to its original state. This behavior is typically observed in certain metals and polymers.
Let's break down the options and understand why option A is the correct answer:
a) It does not recover its original shape/size when the deforming force is removed.
- This is the definition of a perfectly plastic body. When the deforming force is applied, the body undergoes plastic deformation, which means it changes shape without returning to its original form.
b) It has the property of stretching indefinitely.
- This statement describes the behavior of a material that is ductile, not perfectly plastic. Ductile materials, such as metals, can undergo plastic deformation by stretching without breaking, but they still have the ability to recover some of their original shape when the deforming force is removed.
c) It expands without breaking, on the subjection of a large strain.
- This statement describes the behavior of a material that is both ductile and tough, but not perfectly plastic. Tough materials can withstand large strains and absorb energy without breaking, but they can still partially recover their original shape after deformation.
d) It is not affected by external force.
- This statement is incorrect as all materials are affected by external forces. The behavior of a perfectly plastic body is specifically defined by its inability to fully recover its original shape when the external force is removed.
In summary, a perfectly plastic body does not recover its original shape or size when the deforming force is removed. This behavior distinguishes it from materials that are ductile or tough, which can undergo plastic deformation but still have some ability to recover their original shape.
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