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NASA Paper Mars Helicopter
https://www.jpl.nasa.gov/edu/resources/project/make-a-paper-mars-helicopter-2/
Gravity
A force that pulls everything down toward the Earth.
Air Resistance
The push of air against something moving through it — it slows things down.
Force
A push or a pull that makes something move, stop, or change direction.
Friction
A force that happens when two things rub against each other, like paper against air.
Lift
The upward force that helps something like a helicopter or plane stay in the air.
Drag
A force that tries to slow something down as it moves through the air.
Balanced Forces
When all the pushes and pulls on an object are equal, so it stays still or moves steadily.
Design
A plan or drawing you make before building something. It shows how it will look and work.
Variable
Something you change on purpose in an experiment — like the size of the helicopter blades.
Data
The information you collect during an experiment, like how fast or how long the helicopter falls.
Below: Helicopters in Nature: Maple Seeds
https://www.sciencebuddies.org/stem-activities/gone-with-the-wind-plant-seed-dispersal?from=Blog