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