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- Author:
-
Mary R. Hebrank
- Subject:
- Mathematics and Statistics, Science and Technology
- Institution Name:
- Engineering K-Ph.D. Program, Duke University
- Collection:
-
TeachEngineering
- Grade Level:
- Primary, Secondary
- Abstract:
In the first of two lessons of this curricular unit, students are introduced to the concept of friction as a force that impedes motion when two surfaces are in contact. They work in teams to use a spring scale to drag an object such as a ceramic coffee cup along a table top or the floor; the spring scale allows them to measure the frictional force that exists between the moving cup and the surface it slides on. By modifying the bottom surface of the cup, students find out what kinds of surfaces generate more or less friction. They also discover that both static and kinetic friction are involved when an object initially at rest is caused to slide across a surface. In the second lesson of the unit, students design and conduct experiments to determine the effects of weight and surface area on friction. They discover that weight affects normal friction (the friction that results from surface roughness), but for very smooth surfaces, the friction due to molecular attraction is affected by contact area.
- Languages:
- English
- Material Type:
- Activities and Labs, Lesson Plans
- Media Format:
- Graphics/Photos, Text/HTML
- Conditions of Use:
-
Read the fine print
Resources may be used on a nonprofit, non-commercial basis by educators, without any fee or cost to access, link to and use, or in any manner alter, revise, copy, edit, translate or digitize.
- Copyright Holder:
- Duke University
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