science test gr8 chapter 1 Flashcards
system
a group of parts that function together to perform a specific task
physical system
a group of physical parts that function together to perform a specific task
social system
a group of organisms working together to perform a specific task
examples of physical systems
man made: car natural: digestive, solar
examples of social systems
man made: bee colony wolf/coyote pack natural: healthcare, orchestra band, schools
consumerism
Consumerism is the practice and belief that happiness and satisfaction come from purchasing goods and services.
evolution of telephones
Early telephones had a spring-loaded “hook” that moved up when the handset was lifted off its base. They also had a circular disk called a “rotary dial”. Electronic touch-tone phones, in which callers pressed buttons instead of turning dials, became widespread in the 1960s. until the 1980s, most telephones were connected by wires.
subsystems help….
a larger system do its job.
the subsystems in a can opener are
a holding and a cutting subsystem
a turning subsystem
mechanisms are the part of a subsystem that change one kind of… into another
Force
Action
Motion
Energy
the mechanisms of a can openers holding and cutting subsystem are…
a cutting wheel, a handle,
subsystems in the digestive system
organs, like the mouth and the stomach
mechanisms in the mouth…
the teeth; they cut or grind food into smaller peices
industries:
groups of physical and social systems that work together
inputs
the force, energy, or materials that go into a system
