Teaching Physics with the Physics Suite
Edward F. Redish
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Teaching Physics with the Physics Suite Edward F. Redish Home | Action Research Kit| Sample Problems | Resources | Product Information |
Problems Sorted by Type | Problems Sorted by Subject | Problems Sorted by Chapter in UP |
A student makes the following argument: "I can prove a dollar equals a penny. Since a dime (10 cents) is one-tenth of a dollar, I can write:
10¢ = 0.1 $
Square both sides of the equation. Since squares of equals are equal,
100 ¢ = 0.01 $.
Since 100 ¢ = 1 $ and 0.01 $ = 1 ¢ it follows that 1$ = 1 ¢."
What's wrong with the argument?
Page last modified September 30, 2002: G06