MRO (M1) GENERAL PRINCIPLES (section 1,2)

The amount of energy absorbed per unit mass of tissue at a given site: expressed in roentgens.

dose

The amount of energy absorbed per unit mass of tissue at a given site, expressed in roentgens.

Fundamental quantity

A unit that measures a quality by itself, without using any other fundamental unit, such as length, mass, time, and temperature; also called base unit or base quantity.

derived quantity (quantities)

A unit of measurement that combines two or more fundamental units; examples are units that measure density or velocity.

velocity

The speed at which an object is moving. It is measured by determining the distance an object travels in a specific period of time. Waves in the electromagnetic spectrum all travel at the same velocity, the speed of light, or 3 x 10⁸ meters per second. In the SI system velocity is measured in m/s.

acceleration

A rate of change in velocity, measured in meters per second squared (m/sec²).

force

An action that changes the motion of an object. Force (F) equals mass times acceleration.

matter

anything that exists in physical form and has mass (solid, liquid, or gas)

work

The application of force to an object; the product of force times the distance the object is moved. The SI unit of work is the joule.

power

The rate at which work is done is defined as work divided by time.

inertia

The property of an object with mass to resist a change in its state of motion. Objects at rest will continue to stay at rest, and objects in motion will continue to move at the same velocity and direction.

VELOCITY FORMULA

v=d/t (m/s)

ACCERELATION FORMULA

A= Vf-Vi divided by time (m/s squared)

FORCE FORMULA

f=mass x accerelation (N)

MOMENTUM FORMULA

mass x velocity (kg-ms/s)

WORK FORMULA

force x distance (J)

POWER FORMULA

P=work divided by time (w)