1
———— engines have two openings (an intake and an exhaust nozzle)
Rocket
Jet
2
————- engines only have one opening (an exhaust nozzle).
Jet
Rocket
3
———— is a force which tries to pull two objects toward each other.
Drag
Gravity
Lift
4
————— is the force that moves the plane forward.
Gravity
Lift
Drag
Thrust
5
———— engines usually burn chemicals such as petrochemicals and liquid oxygen at very high pressures and temperatures to turn their chemical energy into motion of the ———-.
Rocket, Rocket
Jet, Airplane
