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# Peer Review

## Ratings

### Overall Rating:

Content Quality:
Effectiveness:
Ease of Use:
 Reviewed: May 06, 2001 by Mathematics Overview: This applet is used to demonstrate some of the properties of vector cross product. Given two vectors a, b in the same plane, the cross product vector is produced. One can drag the vectors by their tip to change them. It includes a short tutorial and a list of questions about the vector cross product for students to answer. Learning Goals: To demonstrate some basic properties of vector cross product. Target Student Population: Undergraduate Multivariable Calculus students. Could be used as supplemental material for more advanced classes. Prerequisite Knowledge or Skills: Calculus Type of Material: Curricular Material (Lecture/Demo or Homework Assignment) based on a Java applet (Scriptable) Technical Requirements: Requires a "JAVA-enabled" web browser

### Content Quality

Rating:
 Strengths: Masterfully done. Very clear display of two vectors being cross-multiplied and their product. There is a tab displaying the actual angle between two vectors. The applet itself is attractive and informative. There is a button that allows user to get numerical values for magnitudes of all 3 vectors. There is an extended explanation of the user actions as well as the background material (vector cross product). Concerns: Two vectors are always shown lying in the same plane. It may be helpful to be able to turn the plane off.

### Potential Effectiveness as a Teaching Tool

Rating:
 Strengths: Includes a list of things "to see and to do". These are questions that help students understand the concept of the vector cross product. There is a paragraph explaining how to find the magnitude of the result of a vector cross product as well as the right hand rule for the direction of this vector.This Applet would be an excellent classroom demo tool (for example in a Calculus course) for introducing the cross product of vectors. Instructors can use it to illustrate textbook examples and homework assignments. Concerns: More interesting questions about the vector cross product can be explored using this excellent tool.

### Ease of Use for Both Students and Faculty

Rating:
 Strengths: Clear, easy to understand and use interface and controls for displaying the vector cross product. This is a very straightforward applet to use. The ability to see numerical info and the instructions on how to use the applet are a great benefit. The usability for students of this applet is excellent. Concerns: A simple way to print different plots might be useful.
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