Key Words:
What is a pulley?
What does a pulley do?
What are some real life examples?
- Load, effort, mechanical advantage, wheel and axle
What is a pulley?
- A pulley is a simple machine that uses the wheel and axle in combination with a rope or cable. The pulley or ropes is fixed to an overhanging object or surface and it is used to lift a load. For more information on the difference between a fixed pulley vs. a moveable pulley refer to the videos below.
What does a pulley do?
- A pulley is often used to lift a load by changing the direction and force required to do so.
What are some real life examples?
- Flagpole, winch, window blinds, bicycle, water well, etc
- Click on the link for pictures of more tools that use pulleys: http://www.mikids.com/SMachinesPulleys.htm
Retrieved October, 22 2013
|
Retrieved October 23, 2013
|
Retrieved October 25, 2013
|
Activity:
Watch the following videos. Pause and rewind if they move to quickly. Pay attention to key words (listed above). Answer the following questions in your KidBlog.
If you have any questions please feel free to ask tomorrow in science class or write them at the end of your blog post.
Watch the following videos. Pause and rewind if they move to quickly. Pay attention to key words (listed above). Answer the following questions in your KidBlog.
- According to the first video a pulley is a simple or complex machine?
- According to the second video why is this machine called a pulley?
- According to the second video what is the difference between a fixed and moveable pulley?
- According to the third video what happens when you add multiple pulleys?
If you have any questions please feel free to ask tomorrow in science class or write them at the end of your blog post.