Determination for the grade level for grades five through nine of the difficulty of the principle: whenever one body moves over or is rubbed against another body, a resistance to motion takes place, which results in the production of heat

Thesis (Ed.M.)--Boston University

Bibliographic Details
Main Author: Sahlberg, Henning A
Language:en_US
Published: Boston University 2014
Online Access:https://hdl.handle.net/2144/8085