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a engine
a propeller
It is the propeller.
propeller.
propeller
a Propeller
motor paddle
A screw is a simple machine that can convert rotational motion into linear motion. By rotating the screw, the inclined plane wrapped around the cylinder pushes objects along the screw's axis.
Friction - the force that makes it difficult for one object to slide along the surface of another
Car engines burn fuel in cylinders. When the fuel burns the air in the cylinders expands. The expanding air pushes down on a piston. The piston pushes down on a crankshaft. Then the piston comes back up. The piston going down and up makes the crankshaft rotate. This rotating motion is transferred to the wheels of the car. That pushes the car along. Thus the fuel burning in the cylinders pushes the pistons. Without Petrol to burn in the cylinders, the pistons would not push the crankshaft. It would not make the wheels move.
The voltage.
Gravity. And, we are moving right along with the surface.