The Screw

Questions

1. Details What is a screw?

   a wheel with a groove that holds a rope or cable two sloping surfaces that meet at a thin, sharp edge a stiff bar that turns on a fixed point called a fulcrum an inclined plane wrapped around a rod
2. Details Which of these is an example of a screw?

   a window blind a doorstop a light bulb base a screwdriver handle
3. Vocabulary What does "thread" mean?

   a simple machine with a thin edge that splits or holds things a kind of battery the ridge that winds around a screw a push or a pull
4. Main idea What is this passage mostly about?

   how a lever makes work easier how a pulley makes work easier how a screw makes work easier how a wedge makes work easier
5. Cause and effect According to the passage, what happens when you use a screw?

   Turning the big wheel a long way turns the small axle a short way with more force, or turning the axle makes the wheel's edge move fast.. Pushing the thin edge into something forces it apart, changing a push forward into a push outward.. Turning the screw many times moves it a short distance into the wood with great force, holding things tightly together.. Pulling down on the rope lifts the load up.
6. Vocabulary What does a simple machine do, according to the passage?

   makes things heavier makes work easier by changing the force needed or its direction stores energy in batteries uses a motor to move
7. Inference Why might someone choose this machine over lifting or pushing by hand?

   It makes the load weigh less. It lets them use less force to do the same job. It needs no effort at all. It always makes the job faster.

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