Collision
Channel: 宇宙のすべての知識 プリンシピア
Date: 2019-03-13

Collision, by Wikipedia https://en.wikipedia.org/wiki?curid=40898 / CC BY SA 3.0

#Mechanics
#Collision
Collision

A collision is the event in which two or more bodies exert forces on each other in about a relatively short time. Although the most common colloquial use of the word "collision" refers to incidents in which two or more objects collide with great force, the scientific use of the word "collision" implies nothing about the magnitude of the force.

Some examples of physical interactions that scientists would consider collisions:

Some colloquial uses of the word collision are:

Collision is short-duration interaction between two bodies or more than two bodies simultaneously causing change in motion of bodies involved due to internal forces acted between them during this. Collisions involve forces (there is a change in velocity). The magnitude of the velocity difference just before impact is called the closing speed. All collisions conserve momentum. What distinguishes different types of collisions is whether they also conserve kinetic energy. The Line of impact is the line which is colinear to the common normal of the surfaces that are closest or in contact during impact. This is the line along which internal force of collision acts during impact, and Newton's coefficient of restitution is defined only along this line. Collisions are of three types. They are: 1.perfectly elastic collision 2.inelastic collision 3.perfectly inelastic collision.

Specifically, collisions can either be "elastic," meaning they conserve both momentum and kinetic energy, or "inelastic," meaning they conserve momentum but not kinetic energy. An inelastic collision is sometimes also called a "plastic collision."

A “perfectly inelastic” collision (also called a "perfectly plastic" collision) is a limiting case of inelastic collision in which the two bodies stick together after impact.

The degree to which a collision is elastic or inelastic is quantified by the coefficient of restit...