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A body is said to be perfectly elastic if
  • a)
    it can move freely
  • b)
    it is not effected by external force
  • c)
    it recovers its original shape / size when the deforming force is removed
  • d)
    its surface is perfectly smooth
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
A body is said to be perfectly elastic ifa)it can move freelyb)it is n...
A body is said to be perfectly elastic when its coefficient of restitution is 1 or we observe total  reformation in the body. That means that whatever hits it doesn't lose any of its kinetic energy or once the body gets totally reformed after a collision.
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A body is said to be perfectly elastic ifa)it can move freelyb)it is n...
Introduction:
A body is said to be perfectly elastic if it is able to recover its original shape and size when the deforming force is removed. In other words, it undergoes deformation under external forces but regains its original form once these forces are removed.

Explanation:
To understand why option 'C' is the correct answer, let's discuss the concept of elasticity and the characteristics of a perfectly elastic body.

1. Elasticity:
Elasticity is the property of a material that enables it to regain its original shape and size after being deformed by an external force. It is a measure of how well a material can resist permanent deformation.

2. Deformation:
When a force is applied to a body, it undergoes deformation, which can be either elastic or plastic. Elastic deformation is temporary and reversible, while plastic deformation is permanent and irreversible.

3. Perfectly Elastic Body:
A perfectly elastic body is one that undergoes only elastic deformation when subjected to external forces. This means that when the deforming force is removed, the body instantly and completely recovers its original shape and size.

4. Characteristics of a Perfectly Elastic Body:
There are a few key characteristics that define a perfectly elastic body:

- Instantaneous Recovery: A perfectly elastic body regains its original shape and size instantaneously, without any delay or time lag.

- Complete Recovery: The body recovers its original form completely, without any permanent deformation or change in its physical properties.

- Conservation of Energy: The total energy of the system remains constant during the deformation and recovery process. No energy is lost or dissipated.

- Linear Relationship between Stress and Strain: In a perfectly elastic body, the stress (force per unit area) is directly proportional to the strain (deformation per unit length). This relationship holds true as long as the elastic limit of the material is not exceeded.

Conclusion:
In conclusion, a body is said to be perfectly elastic if it can recover its original shape and size when the deforming force is removed. This characteristic distinguishes it from bodies that exhibit plastic deformation or permanent changes after being subjected to external forces.
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Community Answer
A body is said to be perfectly elastic ifa)it can move freelyb)it is n...
It's the definition. take the example of rubber and understand it.
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Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those can't stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Which of the following statement is false?

Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those can't stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Aluminium is a ............... materials.

Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those can't stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Ceramic is a ............... material

Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those can't stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Hooks law is applicable for

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A body is said to be perfectly elastic ifa)it can move freelyb)it is not effected by external forcec)it recovers its original shape / size when the deforming force is removedd)its surface is perfectly smoothCorrect answer is option 'C'. Can you explain this answer?
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