Science Unit 4 Flashcards
lighter than air vehicles
Zeppelins
Czech word meaning “workers” or “slaves”
Robotnik
the physical form of the devices that makes it usable
design
what the device is supposed to do
function
done when a force acts on an object to make an object move (?= F x d)
work
measure of how the speed of the object is affected by a machine (?= ID/OD)
Speed ratio
the rate of change position of an object in any direction
speed
the fluid in a piston
Output piston
the output force exerted over a distance
Output distance
the syringe which you press the piston in a hydraulic system
Input piston
the length of a sloped surface
input distance
the mechanical advantage of a perfect machine with no loss of useful work
Ideal mechanical advantage
amount of force applied to a given area (?= F/A)
pressure
pressure applied to an enclosed tube transmits an equal amount of force in all direction
Pascel’s law
force a machine applies to an object
output force
force applied to the machine
input force
System that uses liquid under pressure to move a load
hydraulic system
AKA the mechanical advantage
force ratio
force that opposes motion
friction
measurement of how well a machine or device uses energy
Efficiency (Eff= MA/SR x 100%)
amount by which a machine can multiply the force
Mechanical Advantage (MA= OF/IF)
the central point in a lever (aka the fulcrum)
pivot
the central point on a lever (aka the pivot)
fulcrum
special type of linkage for transferring energy from the engine to the wheels on a car
transmission
a pair of wheels with teeth that interlink
gears
part on the rim of a car tire
sprockets
made of 2 wheels with different diameters
wheel and axle
system in which simple machines work together
complex machine
a group of parts that work together to form a complex machine
system
a smaller group of parts within a complex machine
subsystem
belt or chain to transfer energy from energy sources to an object
linkage
a series of buckets attached to a long rope
Sakai
tool or device made up of one basic machine
simple machine
a rigid bar that can rotate around a fixed point
lever
has a fulcrum in the middle a load on one side and force on the other
1st class lever
load between the fulcrum and effort
2nd class lever
effort force in the middle load and fulcrum on either side
3rd class lever
ramp
inclined plane
cylinder with an inclined plane wrapped around it
screw
looks like an inclined plane but if forced into an object
wedge
rope moved by wheel system
pulley
a device that helps us work
machine
