Question

Coefficient of Restitution = 0 Objectives: Partially elastic collisions are defined by the coefficient of restitution between the two objects. In this experiment you will a. Propose a procedure to measure the coefficient of restitution b. Determine the coefficient of restitution for a racquet ball c. Determine whether the coefficient of restitution depends on velocity Introduction An elastic collision is one in which mechanical energy is conserved. A perfectly inelastic collision is one in which some of the mechanical energy is lost in the collision. To fully analyze inelastic collisions, we need to know the coefficient of restitution between the colliding objects. The coefficient of restitution e is defined as the ratio of the outgoing relative speed between the objects v2 to the incoming relative speed between the objects Vi e = V/v (1) It is a characteristic of the two objects. For example, two perfect superballs (elastic collision have a coefficient of restitution e = 1.0; objects that stick together in a collision have e = 0. If the collision is between a moving object and a large, fixed object (such as the floor), then the large fixed object does not change velocity, only the moving object. Experiment 1. Make a prediction: Will the coefficient of restitution be constant for all velocities, or will it depend on the initial velocity? If it depends on initial velocity, should it increase or decrease with initial velocity? Explain your reasoning,

Answer 1

Que', 0 Coefficient is restitution will not depend on initial velocity, because it is property of material. - ② an experiment here we will drop a ball from 1 meter height using 1 me scale when its velocity is vi so, vi=52 ghi =52g then bail bounce back with v2 velocity at hz height so usiing scale we will measure the height So, V₂ = Jag ha Ano 12 = exy Jagtz - Izghz y Jagts izg Now saune experimew perform from hoog in height measure by .. . V, - ] 27x0.9 at the height then ball bounce back at hz. teigu scale so 12 = 129 hz then - 12ghz T1.8g e = T ratio of 4 2 or in same in nex from this experiment we find coefficient of restitution e all cases.