The Wheel and Axle

Questions

1. Details What is a wheel and axle?

   a wheel with a groove that holds a rope or cable a stiff bar that turns on a fixed point called a fulcrum an inclined plane wrapped around a rod a wheel joined to a rod, called an axle, so they turn together
2. Details Which of these is an example of a wheel and axle?

   a light bulb base a slide a jar lid a steering wheel
3. Vocabulary What does "axle" mean?

   a push or a pull the ridge that winds around a screw the rod at the center of a wheel that turns with it a kind of battery
4. Main idea What is this passage mostly about?

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

   Turning the screw many times moves it a short distance into the wood with great force, holding things tightly together.. Pushing down on one end of the bar lifts a load on the other end. 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.. 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?

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

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

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