Screw
A screw is a rod with a slope wound round it in a spiral, called the thread. Each full turn drives the screw a little way in, so a small turn of the hand pulls it in with a big force and holds things together very firmly. Wind a paper triangle round a pencil and its sloping edge makes the same spiral. Bottle caps, jar lids and bolts hold on with threads too.
Depth 1 · Foundation
You know that a screw's thread is a slope wound round a rod, and that turning it a little at a time pulls it in and holds things tight.
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- 1
Foundation
You know that a screw's thread is a slope wound round a rod, and that turning it a little at a time pulls it in and holds things tight.
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