Mechanical Engineering Exam > Mechanical Engineering Questions > The impact is said to be inelastic or plastic...
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The impact is said to be inelastic or plastic when the coefficient of restitution is ________.
- a)zero
- b)one
- c)greater than one
- d)0.5
Correct answer is option 'A'. Can you explain this answer?
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The impact is said to be inelastic or plastic when the coefficient of ...
- Momentum is conserved in all collisions.
- In elastic collision, kinetic energy is also conserved.
- In inelastic collision, kinetic energy is not conserved. In a perfectly inelastic collision, objects stick together after the collision.
Perfectly elastic collision:
If the law of conservation of momentum and that of kinetic energy hold good during the collision.
If the law of conservation of momentum and that of kinetic energy hold good during the collision.
Inelastic collision:
Law of conservation of momentum holds good during a collision while that of kinetic energy is not conserved.
Coefficient of restitution (e)
Law of conservation of momentum holds good during a collision while that of kinetic energy is not conserved.
Coefficient of restitution (e)
- For perfectly elastic collision, e = 1
- For inelastic collision, e < 1
- For perfectly inelastic collision, e = 0
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The impact is said to be inelastic or plastic when the coefficient of ...
The concept of coefficient of restitution:
The coefficient of restitution (COR) is a measure of the elasticity of a collision between two objects. It is defined as the ratio of the relative velocity of separation after collision to the relative velocity of approach before the collision.
Definition of inelastic or plastic impact:
In an inelastic or plastic impact, the two objects stick together after the collision and move as one. In other words, there is no separation between the objects after the collision, and they have a common final velocity.
Explanation of the impact being inelastic or plastic when the coefficient of restitution is zero:
When the coefficient of restitution is zero, it means that the relative velocity of separation after the collision is zero. This implies that the objects do not separate after the collision and stick together. As a result, the impact is said to be inelastic or plastic.
Example to illustrate the concept:
Consider a ball that is dropped vertically onto a flat surface. When the ball hits the surface, it loses all of its initial velocity and comes to rest momentarily. In this case, the coefficient of restitution is zero because the relative velocity of separation after the collision is zero. The ball and the surface stick together, and the impact is inelastic or plastic.
Conclusion:
When the coefficient of restitution is zero, it indicates that the objects do not separate after the collision and stick together. This type of impact is known as an inelastic or plastic impact.
The coefficient of restitution (COR) is a measure of the elasticity of a collision between two objects. It is defined as the ratio of the relative velocity of separation after collision to the relative velocity of approach before the collision.
Definition of inelastic or plastic impact:
In an inelastic or plastic impact, the two objects stick together after the collision and move as one. In other words, there is no separation between the objects after the collision, and they have a common final velocity.
Explanation of the impact being inelastic or plastic when the coefficient of restitution is zero:
When the coefficient of restitution is zero, it means that the relative velocity of separation after the collision is zero. This implies that the objects do not separate after the collision and stick together. As a result, the impact is said to be inelastic or plastic.
Example to illustrate the concept:
Consider a ball that is dropped vertically onto a flat surface. When the ball hits the surface, it loses all of its initial velocity and comes to rest momentarily. In this case, the coefficient of restitution is zero because the relative velocity of separation after the collision is zero. The ball and the surface stick together, and the impact is inelastic or plastic.
Conclusion:
When the coefficient of restitution is zero, it indicates that the objects do not separate after the collision and stick together. This type of impact is known as an inelastic or plastic impact.
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The impact is said to be inelastic or plastic when the coefficient of restitution is ________.a)zerob)onec)greater than oned)0.5Correct answer is option 'A'. Can you explain this answer?
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