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We're going to a some sites that have lots of information about gears
and pulleys. Double-Click on the buttons to view the answers! Single-Click
on the buttons again to hide the answers.
First, click on this link for information on
how
a block and tackle works at the
How
Stuff Works website.
Answer the following questions after you have visited the website.
1. What is a block and tackle?
2. How does the force you have to apply to a 100 pound weight change
when you add a pulley?
3. How does it change when you have two pulleys?
4. Complete this sentence about pulleys: The greater the force you apply,
the _____ rope you have to pull.
5. Complete this sentence about levers: A longer arm provides _____ force.
6. Give 2 examples of machines that use levers.
Now, let's learn about gears!! Click here and read about how gears work.
7. Give 2 examples of machines that use gears.
8. Give 1 reason why gears are used.
9. Complete this sentence about gears: A smaller gear spins _____ than
a large gear.
10. Define the circumference of a circle.
11. Name one advantage of gears with teeth.
13. Include your favorite picture of gears.
14. Name an example of another device that uses simple machines.
15. Which simple machines are used?
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