Simple Machines Continued: Wheel and Axles & Pulleys Questions





Wheel and Axles


1.     List three types of simple machines that are used for transmitting rotational motion. (p. 18)
2.     What is the MA for all these groups of machines?
3.     In these groups of machines the __________________ must move over a greater _______________ than the _________________. (p. 18)
4.     Briefly explain what the two main parts of a wheel and axle system are. Include a quick sketch. (p. 18 / figure 1)
5.     Answer the question below figure 2. (p. 18)
6.     List four or more examples of common wheel-and-axle systems. (p. 18)
7.     Explain how one of the three systems from the previous question work. (p. 18)
8.     Wheel and axle system can change: rotary movement into ___________ movement OR rotary movement into _____________________ OR linear motion into _______________ (p. 18)
9.     Solve for the velocity ratio in figure 3. (p. 18 / p. 12 – formula)









Pulley Systems

1.     Give two examples of where pulley systems are used in the real world. (p. 19)
2.     Define, in your own words, what a pulley system is. (p. 19/ glossary)
3.     The two types of pulley systems are known as ___________ or ______________. (p. 19)
4.     Explain what the purpose, benefit and MA of a single, fixed pulley is. (p. 19/figure 4a)
5.     In figure 4b the load force is 90N. The effort force from pulling the rope is only 45N. Where is the other 45N of effort force coming from? (p. 19/ figure 4b)
6.     Clearly explain why the MA of a single moveable pulley is always 2. (p. 19 – paragraph 2/figure 4b)
7.     Explain an easy way to determine the MA of a pulley system just by looking at it. (p. 19 – paragraph 3)
8.     Using the trick describe in the question above, what is the MA for the pulley system in figure 4b? Explain how you know. (p. 19)
9.     In a pulley system that has an MA greater (bigger) than 1, smaller effort forces allow you to lift larger loads. What is the “penalty” for this gain in mechanical advantage? (p. 19)
10. Complete page 21 #2.
11. Complete page 21 #4.
12. Complete page 21 #5
13. Complete page 21 #6.
14. Complete page 21 #8a)


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