Fundamentals of Radiologic Science Questions with Complete Answers, Rated A+

basic quantities of physics - mass, length, time secondary quantities - derived from a combination of one or more of the base quantities: volume, mass, density, velocity length - basic unit of measurement is the meter mass - primary characteristic of matter defined as the quantity of matter contained in a physical object time - basic unit of measurement is seconds measurements - composed of a magnitude and a unit magnitude - the designated number unit - the designated standard or measurement mechanics - the segment of physics that deals with objects at rest (statics) and objects in motion (dynamics) velocity - the rate of change of an objects position over a given amount of time average velocity - the average rate of speed of an object from start to finish acceleration - the rate of change of the velocity/speed of an object over a given amount of time 1. law of inertia 2. force 3. action/reaction - Isaac Newton 1686 determined 3 basic principles as fundamental law of motion. newtons first law: law of inertia - a body will remain at rest or will continue to move in a straight line with a constant velocity unless acted on by an external force newtons second law: force - required to change state of motion (push or pull) newtons third law: action/reaction - for every action/force there is an equal and opposing reaction/force weight - a force on a body caused by the pull of gravity momentum - total momentum before an interaction is equal to the total momentum after an interaction work - refers to the product of a force applied to an object over a given distance power - the rate at which work is being performed over a given amount of time energy - the ability to do work law of conservation energy - energy can be transformed from one form to another but it can't be created or destroyed potential energy - capacity to do work because of the position of the object (stored energy) kinetic energy - energy in motion (anything in motion is said to have kinetic energy) forms of energy - chemical, electrical, thermal, nuclear, electromagnetic