The Pulley

Questions

1. Details What is a pulley?

   a wheel with a groove that holds a rope or cable a wheel joined to a rod, called an axle, so they turn together a flat, sloping surface, like a ramp a stiff bar that turns on a fixed point called a fulcrum
2. Details Which of these is an example of a pulley?

   an axe a doorstop a window blind a light bulb base
3. Vocabulary What does "load" mean?

   the rod at the center of a wheel that turns with it a push or a pull the fixed point a lever turns on the object a machine moves or lifts
4. Main idea What is this passage mostly about?

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

   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. Pushing the thin edge into something forces it apart, changing a push forward into a push outward.. Moving a load up a long, gentle ramp takes less force than lifting it straight up, but you have to move it a longer distance..
6. Vocabulary What does a simple machine do, according to the passage?

   makes things heavier runs on electricity makes work easier by changing the force needed or its direction stores energy in batteries
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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