NDLI: Elastic and Inelastic Collisons

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Kinetic Energy and Work-Energy Principle

Potential Energy, Mechanical Energy and Power

Elastic and Inelastic Collisons

Content Provider	AK Lectures
Description	During the moment of collision, both objects experience a slight deformation as a result of the force that acts on either object. There are two types of collisions that we should consider: elastic and inelastic collisions. During elastic collisions, such as a collision between two or more subatomic particles, the total kinetic energy and momentum of the system of objects is conserved. This implies that the sum of the kinetic energies of the objects before the collision is equal to the sum of the kinetic energies of the objects following the elastic collision. Likewise, the sum of the momentum of the objects before the collision is equal to the sum of the momentum after the collision takes place. For any elastic collision, we have a system of two equations which means we can use them to solve for any two unknowns. An inelastic collision is a collision between objects in which some of the kinetic energy is transformed into some other form of energy, such as thermal energy or electromagnetic radiation such as sound or light waves. Most of the collisions that take place on a macroscopic level are to some extent inelastic because they always transform kinetic energy to some other form of energy. For example, two billiard balls striking one another are usually considered to be elastic even though sound waves are produced. This implies that kinetic energy is not conserved in inelastic collisions. However the momentum of the object is still conserved so we can use this equation to solve for one unknown.
Language	English
Access Restriction	Open
Subject Keyword	Classical Physics equations collision system unknowns deformation force acts particles
Content Type	Video
Educational Role	Teacher Student
Educational Use	Self Learning Lecture Reading
Resource Type	Video Lecture
Education Level	Under Graduate
Subject	Classical mechanics; solid mechanics

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