The Lever

Questions

1. Details What is a lever?

   a stiff bar that turns on a fixed point called a fulcrum a wheel joined to a rod, called an axle, so they turn together an inclined plane wrapped around a rod a flat, sloping surface, like a ramp
2. Details Which of these is an example of a lever?

   a jar lid a window blind a light bulb base a bottle opener
3. Vocabulary What does "fulcrum" mean?

   a kind of battery a measure of temperature a simple machine with a thin edge that splits or holds things the fixed point a lever turns on
4. Main idea What is this passage mostly about?

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

   Pushing down on one end of the bar lifts a load on the other end. Pushing the thin edge into something forces it apart, changing a push forward into a push outward.. Pulling down on the rope lifts the load up. 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 makes work easier by changing the force needed or its direction runs on electricity uses a motor to move

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