Book reviews

Myocybernetic control models of skeletal muscle: characteristics and applications, H. Hatze, University of South Africa Press, Pretoria, 1981. xi+221 pp, ISBN 0 86981 216 5

Psychology of motor learning, (2nd edition) J.B. Oxendine, Prentice‐Hall, Inc., New Jersey, 1984. 403 pp, £26.75 (hb), ISBN 0 13 736603 5

Exercise, health and medicine, Symposium Procedings, Sports Council, London, 1984. 66 pp, £4.00 (pb), ISBN 0 906577 42 X

Human motor actions: Bernstein reassessed, H.T.A. Whiting (ed.), North Holland, Amsterdam, 1984. xxxv+559 pp, £40.00 (hb), ISBN 0 4444 868135

Sporting body sporting mind, John Syer and Christopher Connolly, Cambridge University Press, 1984. 160 pp, £3.95 (pb), ISBN 0 521 26935 0

Exercise physiology: human bioenergetics and its applications, George A. Brooks and Thomas D. Fahey, John Wiley & Sons, UK, 1984. xxiv + 810 pp, £30 (hb) ISBN 0 471 88827 3     

The dynamic impact characteristics of tennis balls with tennis rackets

Abstract

The dynamic properties of six types of tennis balls were measured using a force platform and high-speed digital video images of ball impacts on rigidly clamped tennis rackets. It was found that the coefficient of restitution reduced with velocity for impacts on a rigid surface or with a rigidly clamped tennis racket. Pressurized balls had the highest coefficient of restitution, which decreased by 20% when punctured. Pressureless balls had a coefficient of restitution approaching that of a punctured ball at high speeds. The dynamic stiffness of the ball or the ball-racket system increased with velocity and pressurized balls had the highest stiffness, which decreased by 35% when punctured. The characteristics of pressureless balls were shown to be similar to those of punctured balls at high velocity and it was found that lowering the string tension produced a smaller range of stiffness or coefficient of restitution. It was hypothesized that players might consider high ball stiffness to imply a high coefficient of restitution. Plots of coefficient of restitution versus stiffness confirmed the relationship and it was found that, generally, pressurized balls had a higher coefficient of restitution and stiffness than pressureless balls. The players might perceive these parameters through a combination of sound, vibration and perception of ball speed off the racket.     

Learning theories and environments: A student-initiated intelligent computer-assisted environment

Intelligent computer-assisted instructional systems have been constructed and applied within a wide range of fields. Very few of these systems make explicit a central or set of core learning theories or learning environments upon which a system is based. However, many of these systems have implicitly employed learning theories and environments. This paper looks at a variety of intelligent computer-assisted systems with a view towards uncovering the latent learning theories they employ. The interplay of the various learning theories needed to realise a student-initiated learning environment are discussed. The central features required for such an environment to function and the limitations of realising such a learning environment due to the state of the art of present day systems are also discussed. Specializations: physics education; computer education; intelligent computer-assisted instructional systems; physics problem solving. Specializations: chemical education, technology education, history and philosophy of science, learning theories.     

Engineering design processes in seventh-grade classrooms: bridging the engineering education gap

This paper reports on some findings from the first year of a three-year longitudinal study, in which seventh- to ninth-graders were introduced to engineering education. Specifically, the paper addresses students’ responses to an initial design activity involving bridge construction, which was implemented at the end of seventh grade. This paper also addresses how students created their bridge designs and applied these in their bridge constructions; their reflections on their designs; their reflections on why the bridge failed to support increased weights during the testing process; and their suggestions on ways in which they would improve their bridge designs. The present findings include identification of six, increasingly sophisticated levels of illustrated bridge designs, with designs improving between the classroom and homework activities of two focus groups of students. Students’ responses to the classroom activity revealed a number of iterative design processes, where the problem goals, including constraints, served as monitoring factors for students’ generation of ideas, design thinking and construction of an effective bridge.     

Film Genre Studies

Les Adams and Buck Rainey's Shoot-em-Ups: The Complete Reference Guide to Westerns of the Sound Era (New Rochelle, N.Y.: Arlington House, 1978---$30.00)

David Rothel's The Singing Cowboys (Cranbury, N.J.: A.S. Barnes, 1978---$19.95)

Lawrence H. Suid's Guts & Glory: Great American War Movies (Reading, Mass.: Addison-Wesley, 1978---$12.95/6.95)

Jack G. Shaheen, ed. Nuclear War Films (Carbondale: Southern Illinois University Press, 1978---$10.00/4.95)

Thomas Cripps' Black Film as Genre (Bloomington: Indiana University Press, 1978---$10.00)

Neil P. Hurley's The Reel Revolution: A Film Primer on Liberation (Maryknoll, N.Y.: Orbis Books, 1978---$7.95, paper)

Anita Loos' San Francisco, A Screenplay (Carbondale: Southern Illinois University Press, 1979---$10.00/4.95)

Eugene Rosow's Born to Lose: The Gangster Film in America (New York: Oxford University Press, 1978---$19.95)     

Sent from My iPhone: The Medium and Message as Cues of Sender Professionalism in Mobile Telephony

The growing ubiquity of mobile telephony able to send e-mail raises new questions, and renews old issues, about the effect of the medium on a message. This article reports experimental results testing effects of user- and medium-generated cues on perceptions of message senders. Grounded in warranting theory, we assess the interaction of low- and high-warrant cues on perceptions of the sender's professionalism, hypothesizing senders of grammatically accurate messages are perceived as more credible. However, we also hypothesize an interaction between grammatical accuracy and the system-generated high-warrant cues from the mobile device used to send the message. Responses from 111 students assessing the credibility of an e-mail sender indicate that, although a message's user-generated content (grammatically accurate vs. erred) influences receiver's perceptions, negative attributions are attenuated by cues reflecting the transmission medium (i.e., a message's mobile signature block). Findings offer theoretical implications for warranting theory. Additionally, results suggest practitioners need to craft a message and indicate the transmission medium strategically to mitigate any impacts on attributions of professionalism to message receivers.     

The stepping stones of learning and evaluation

Based on the teachers’ lectures and evaluations we elaborate on a model of the aspects of learning. Inside the framework of this model three ways for solving a given problem relating to the previous teaching are presented.

We describe and analyse a method which is useful in selecting an evaluation task adapted to intended objectives, helps in the interpretation of the students’ performances and acts as a guide to the possible inferences about what the students acquire.