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Inventions
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a set of steps leading from one floor of a building to another, typically inside the building.
stairs
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something that can make and receive calls over a radio frequency
cellphone
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a device used to convert electricity into light, consisting of a source of illumination
light bulb
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two parts rotate together in which a force is transferred from one to the other.
wheel and axle
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screw
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An inclined plane, is a flat supporting surface tilted at an angle
ramp
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axe
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.This can be, for example, to drive nails into wood, to shape metal, or to crush rock.
hammer
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wedge
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doorknob
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lever
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