Factors Affecting Friction

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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:

Based on what they have already learned about friction, students formulate hypotheses concerning the effects of weight and contact area on the amount of friction between two surfaces. In the Associated Activities (Does Weight Matter? and Does Area Matter?), students design and conduct simple experiments to test their hypotheses, using procedures similar to those used in the previous lesson (Discovering Friction). An analysis of their data will reveal the importance of weight to normal friction (the friction that occurs as a result of surface roughness) and the importance of surface area to the friction that occurs between smooth surfaces due to molecular attraction. Based on their data, students will also be able to calculate coefficients of friction for the materials tested, and compare these to published values for various materials.

Languages:

English

Material Type:

Activities and Labs, Lesson Plans

Media Format:

Graphics/Photos, Text/HTML

Conditions of Use:

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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