1) A machine that makes vehicles move by burning fuel or using electricity. a) Force b) Engine 2) A push or pull that makes something move or change direction. a) Force b) Gravity 3) A bag made of thin rubber or plastic that you fill with air or gas so it becomes bigger and lighter. a) Balloon b) Atmosphere 4) The force that pulls everything toward the center of the Earth. a) Helium b) Gravity 5) A small space vehicle or part of a spacecraft where astronauts can travel or stay. a) Capsule b) Engine 6) A very light gas that does not burn and is often used to fill balloons. a) Helium b) Gravity 7) The gas in the air that humans and animals need to breathe. a) Helium b) Oxygen 8) The layer of air and gases around the Earth or another planet. a) Balloon b) Atmosphere 9) The limit of the speed of sound; when an aircraft goes faster than sound, it “breaks the sound barrier.” a) Parachute b) Sound barrier 10) A device made of cloth that opens in the air to slow down a person or object falling from the sky. a) Parachute b) Sound barrier

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