Chapter 12.2, Problem 1DE

CHAPTER-OPENING QUESTION–Guess Now!

The diving board shown here is held by two supports at A and B. Which statement is true about the forces exerted on the diving board at A and B?

1. (a) ${\stackrel{\to }{F}}_A$ is down, ${\stackrel{\to }{F}}_B$ is up, and F_B is larger than F_A.
2. (b) Both forces are up and F_B is larger than F_A.
3. (c) ${\stackrel{\to }{F}}_A$ is down, ${\stackrel{\to }{F}}_B$ is up, and F_A is larger than F_B.
4. (d) Both forces are down and approximately equal.
5. (e) ${\stackrel{\to }{F}}_B$ is down, ${\stackrel{\to }{F}}_A$ is up, and they are equal.

EXERCISE D Return to the Chapter-Opening Question, p. 311, and answer it again now. Try to explain why you may have answered differently the first time.