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ENERGY and ENGINES

Across
In the ____stroke, the piston moves down and draws a fuel-air mixture into the cylinder
This erupts when steam heated by rock deep in the earth blows water out of a crevice in the ground
What opposite magnetic poles or opposite electric charges do
One of these is used in every compass
A device that converts a natural form of energy into useful work
A special jut engine that has no turbine
In the ________ stroke, the piston moves up in the cylinder and compacts the fuel-air mixture
The ________number measures the antiknock quality of a gasoline
A ______ of energy takes place when one object gives some or all of its energy to another object
This device was attached to the engine to pull the first plane through the air
What an automobile engine might do if it was operated at a very low-octane gasoline
A shortened name for propeller
Sails harness the power of the ____?
This system in an internal-combustion engine is designed to keep moving metal parts from becoming too hot or wearing away as a result of friction between them.
Stored energy is called ________energy.
A disk that moves back and forth or up and down in a cylinder
The name given to a special kind of rock which the first compasses were made from
The tendency of gases and liquids to spread themselves out thinly over their surroundings
In an _______-combustion engine, fuel is burned inside the engine
To change from liquid to solid
This type of internal combustion engine has no spark plugs
The force of attraction that exists between any two objects
Down
Everything that takes up space and has mass
This term means "compacted and heavy"
To change from solid to liquid
The last name of the 2 men who flew the first powered airplane
What water becomes at 212 degrees Farenheight
A device powered either by a piston engine and prop, or by a jet engineq
A modern windmill can also be called a wind_______?
This force occurs when one object pushes against another object
A rocket used for military purposes
A figure with 6 sides
Solid water
The result of force moving an object
The force of ______ causes static cling in a dryer
A force that resists motion
This type of engine carries its own supply of oxygen
This force occurs when one object pushes against another object
This is made from oxidant powders and fuel powders for use in a solid-fuel rocket engine
The state of matter in which the molecules are the greatest distance apart
The fuel burned in the internal-combustion engines of most automobiles
What like magnetic poles or like electric charges do
A hollow compartment that houses a piston
Something that can flow from one place to another; either a liquid or a gas
An afterburner often added to this type of jet engine, which is often used in fast military aircraft
The state of matter in which it retains its own definite shape
The ability to do work
To push or pull