Chapter 6.1, Problem 5PSA

To determine

To find whether the stools will wobble or rock.

Answer to Problem 5PSA

Yes, three legged stool will not rock even if they are of different lengths and four legged stool will wobble.

Explanation of Solution

Given information:

A three legged stool and four legged stool are given for comparison.

A three legged stool has 3 points and 3 points which represent a plane.

A four legged stool has 4 points and 4 points may sometimes lie on one plane but often are non-coplanar.