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Why not write about the automobile? You can start with the physics of combustion and the transformation of fuel energy to rotational energy via the pistons. From there move on to the gear box and differential. Talk about the inertia of the tires. Drag force from the wind as the car moves. Traction of the tires to the ground. Displacement of the engine and how that relates to the torque and power of the engine. Gear ratios of the transmission. How a planetary gear works (automatic transmission) vs spur gear ( standard transmission). There will easily be 11 pages of material here.