Retrieved October 23, 2013
Key terms:
What is a gear?
What are some examples of machines that use gears?
- rotation, teeth, mechanical advantage
What is a gear?
- A gear is a wheel and axle that has teeth along the wheel. Often they are used in combination with one another and change the direction of forces. The size of the gear determines the speed at which it rotates. Gears are often used in machines to increase force or speed.
What are some examples of machines that use gears?
- Cars, bicycles, winches, etc.
- Can you think of other machines that use gears?
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Retrieved October 25, 2013
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Activity:
Watch the videos above about gears. Answer the following questions in your KidBlog:
Watch the videos above about gears. Answer the following questions in your KidBlog:
- What did you find most interesting in the video?
- List some examples of machines that use gears in the video
- What other simple machine is often used in combination with a gear?
- Come prepared to discuss gears in class tomorrow. What do you understand? What is still confusing?
- Meet with your group to discuss materials for the classroom machine building contest.
- Pay special attention to the gears videos, as you will have to build a drive system for your upcoming machine project.
