What╎s That Racket? Experiencing Racquet Sports (And Handball) And
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The Bouncing Ball Apparatus As an Experimental Tool
1 The Bouncing Ball Apparatus as an Experimental Tool Ananth Kini Aerospace and Mechanical Engineering, University of Arizona Tucson, AZ 85721, USA Thomas L. Vincent Aerospace and Mechanical Engineering, University of Arizona Tucson, AZ 85721, USA Brad Paden Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106, USA. Abstract The bouncing ball apparatus exhibits a rich variety of nonlinear dynamical behavior and is one of the simplest mechanical systems to produce chaotic behavior. A computer control system is designed for output calibration, state determination, system identification and control of the bouncing ball apparatus designed by Launch Point Technologies. Two experimental methods are used to determine the co- efficient of restitution of the ball, an extremely sensitive parameter of the apparatus. The first method uses data directly from a stable 1-cycle orbit. The second method is based on the ball map combined with data from a stable 1-cycle orbit. For control purposes, two methods are used to construct linear maps. The first map is determined by collecting data directly from the apparatus. The second map is determined from linearization of the ball map. The maps are used to estimate the domains of attraction to the stable 1-cycle orbit. These domains of attraction are used with a chaotic control algorithm to control the ball to a stable 1-cycle, from any initial state. Results are compared and it is found that the linear map obtained directly from the data gives the more accurate representation of the domain of attraction. 1 Introduction The bouncing ball system consists of a ball bouncing on a plate whose amplitude is fixed and the frequency of vibration is controlled. -
Tennismatchviz: a Tennis Match Visualization System
©2016 Society for Imaging Science and Technology TennisMatchViz: A Tennis Match Visualization System Xi He and Ying Zhu Department of Computer Science Georgia State University Atlanta - 30303, USA Email: [email protected], [email protected] Abstract hit?” Sports data visualization can be a useful tool for analyzing Our visualization technique addresses these issues by pre- or presenting sports data. In this paper, we present a new tech- senting tennis match data in a 2D interactive view. This Web nique for visualizing tennis match data. It is designed as a supple- based visualization provides a quick overview of match progress, ment to online live streaming or live blogging of tennis matches. while allowing users to highlight different technical aspects of the It can retrieve data directly from a tennis match live blogging web game or read comments by the broadcasting journalists or experts. site and display 2D interactive view of match statistics. Therefore, Its concise form is particularly suitable for mobile devices. The it can be easily integrated with the current live blogging platforms visualization can retrieve data directly from a tennis match live used by many news organizations. The visualization addresses the blogging web site. Therefore it does not require extra data feed- limitations of the current live coverage of tennis matches by pro- ing mechanism and can be easily integrated with the current live viding a quick overview and also a great amount of details on de- blogging platform used by many news media. mand. The visualization is designed primarily for general public, Designed as “visualization for the masses”, this visualiza- but serious fans or tennis experts can also use this visualization tion is concise and easy to understand and yet can provide a great for analyzing match statistics. -
Rapid Sensory Profiling of Tennis Rackets †
Proceedings Rapid Sensory Profiling of Tennis Rackets † Maximilian Bauer 1,*, Sean Mitchell 1, Nathan Elliott 2 and Jonathan Roberts 1 1 Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3QF, UK; [email protected] (S.M.); [email protected] (J.R.) 2 R&D Racquet Sports, HEAD Sport GmbH, 6921 Kennelbach, Austria; [email protected] * Correspondence: [email protected]; Tel.: +44-7902-592-659 † Presented at the 13th Conference of the International Sports Engineering Association, Online, 22–26 June 2020. Published: 15 June 2020 Abstract: Tennis racket manufacturers rely on subjective assessments from testers during the development process. However, these assessments often lack validity and include multiple sources of inconsistency in the way testers make subjective ratings. The purpose of this research was to investigate the suitability of the free-choice profiling (FCP) method in combination with principle component analysis (PCA) and multiple factor analysis (MFA) to determine the sensory profile of rackets. FCP was found to be a suitable technique to quickly evaluate the sensory profile of rackets; however, consumer testers tended to use ill-defined, industry-generated terms, which negatively impacted discrimination and inter-rater agreement. Discrimination and inter-rater agreement improved for attributes referring to measurable parameters of the rackets, such as vibration. This study furthers our understanding of tennis racket feel and supports racket engineers in designing new subjective testing methods, which provide more meaningful data regarding racket feel. Keywords: feel; sensory analysis; tennis rackets; free-choice profiling; PCA; MFA 1. Introduction Since performance advancements have become more challenging in the tennis racket industry, manufacturers rely increasingly on consumer feedback in terms of racket feel to provide direction in the development process. -
Judy Murray Tennis Resource – Secondary Title and Link Description Secondary Introduction and Judy Murray’S Coaching Learn How to Control, Cooperate & Compete
Judy Murray Tennis Resource – Secondary Title and Link Description Secondary Introduction and Judy Murray’s Coaching Learn how to control, cooperate & compete. Philosophy Start with individual skill, add movement, then add partner. Develops physical competencies, such as, sending and receiving, rhythm and timing, control and coordination. Children learn to follow sequences, anticipate, make decisions and problem solve. Secondary Racket Skills Emphasising tennis is a 2-sided sport. Use left and right hands to develop coordination. Using body & racket to perform movements that tennis will demand of you. Secondary Beanbags Bean bags are ideal for developing tracking, sending and receiving skills, especially in large classes, as they do not roll away and are more easily trapped than a ball. Start with the hand and mimic the shape of the shot. Build confidence through success and then add the racket when appropriate. Secondary Racket Skills and Beanbags Paired beanbag exercises in small spaces that are great for learning to control the racket head. Starting with one beanbag, adding a second and increasing the distance. Working towards a mini rally. Move on to the double racket exercise which mirrors the forehand and backhand shots - letting the game do the teaching. Secondary Ball and Lines Always start with the ball on floor. Develop aiming skills by sending the ball through a target area using hands first before adding the racket. 1 Introduce forehand and backhand. Build up to a progressive floor rally. Move on to individual throwing and catching exercises before introducing paired activity. Start with downward throw emphasising V-shape, partner to catch after one bounce. -
Discrete Dynamics of a Bouncing Ball
Discrete Dynamics of a Bouncing Ball Gilbert Oppy Dr Anja Slim Monash University Contents 1 Abstract 2 2 Introduction - Motivation for Project 2 3 Mathematical Model 3 3.1 Mathematical Description . .3 3.2 Further Requirements of Model . .4 3.3 Non-Dimensionalization . .4 4 Computational Model 5 5 Experimental Approach 6 5.1 General Use of Model . .6 5.2 Focusing on the α = 0.99 Case . .7 5.3 Phase Plane Analysis . .8 5.4 Analytically Finding 1-Periodic Bouncing Schemes . .9 6 Phase Space Exploration 10 6.1 A 1-Periodic regime in Phase Space . 10 6.2 Other Types of Periodic Bouncing . 11 6.3 Going Backwards in Time . 13 7 Bifurcations Due to Changing the Frequency !∗ 15 7.1 Stability Analysis for 1-Periodic Behaviour . 15 7.2 Bifurcations for the V ∗ = 3 1-Periodic Foci . 16 8 Conclusion 20 9 Acknowledgements 21 1 1 Abstract The main discrete dynamics system that was considered in this project was that of a ball bouncing up and down on a periodically oscillating infinite plate. Upon exploring this one dimensional system with basic dynamical equations describing the ball and plate's vertical motion, it was surprising to see that such a simple problem could be so rich in the data it provided. Looking in particular at when the coefficient of restitution of the system was α = 0.99, a number of patterns and interesting phenomena were observed when the ball was dropped from different positions and/or the frequency of the plate was cycled through. Matlab code was developed to first create the scenario and later record time/duration/phase of bounces for very large number of trials; these programs generated a huge array of very interesting results. -
SSG-2000.Pdf
2000 Sunshine State Games Complete Results Table of Contents Archery 3 Artistic Roller Skating 7 Baseball 15 Basketball 17 Boxing 22 Canoe/Kayak 25 Fencing 28 Figure Skating 30 Golf 37 Gymnastics 38 Judo 40 Mountain Biking 43 Racquetball 45 Roller Hockey 47 Rowing 49 Slow Pitch Softball 52 Soccer—Youth 53 Speed Skating 53 Sport Twirling 56 Swimming 60 Synchronized Swimming 71 Tennis 75 Track & Field – Youth 75 Water Polo 92 Weightlifting 94 Wrestling 96 2 Archery Gator Bowman Field Range Saturday, July 8 – Sunday, June 9 28 Target Field Peewee 0-7, Cub 8-11, Youth 12-14, Young Adult 15-17, Adult 18-59, Senior 60+ Peewee Girl Freestyle Limited 1. Gemma Laudicina, Miami, 177 (Games Record) Cub Boy Barebow 1. Don Stulken, Big Pine Key, 156 Cub Boy Freestyle 1. Ryan Smith, Ocala, 496 Youth Girl Bowhunter Freestyle 1. Christine Shaw, West Palm Beach, 340 Youth Girl Freestyle 1. Charlotte McGraw, Miami, 92 (Games Record) Youth Boy Freestyle 1. Michael Mascaro, Miami, 386; 2. Michael Pettitt, Port Richey, 208 Young Adult Men Freestyle 1. Christopher Dees, Tampa, 332 Adult Women Freestyle - A Class 1. Cecelia Kimball, Winter Park, 515; 2. Shelby Rudolph, Port Charlotte, 485 Adult Women Freestyle - B Class 1. Lois Smith, Ocala, 402 Senior Women Freestyle 1. Dorothy Hageman, Leesburg, 483 (Games Record); 2. Virginia Bishop, Wauchula, 476 Adult Women Traditional 1. Rena Mascaro, Miami, 79 (Games Record); 2. Treva Laudicina, Miami, 29 Adult Men Freestyle - AA Class 1. Kevin McCloskey, Miami, 535-47x; 2. Steve Feltus, Ft Lauderdale, 535-45x; 3. Nicky Christie, Lake City, 524 Adult Men Freestyle - A Class 1. -
Bouncing Balls Summer of Innovation Zero Robotics Bouncing Balls Instructor’S Handout
Physics: Bouncing Balls Summer of Innovation Zero Robotics Bouncing Balls Instructor's Handout 1 Objective This activity will help students understand some concepts in force, acceleration, and speed/velocity. 2 Materials At least one bouncy ball, such as a superball or a tennis ball. If you want, you can bring more balls for the students to bounce themselves, but that's not critical. 3 Height Bounce a superball many times in the front of the classroom. Ask the students to call out observations about the ball and its bouncing. Things to observe include: • The ball's starting acceleration and speed are 0; • The ball's acceleration and speed increase until the ball hits the ground and bounces; • After the bounce, the ball returns to a maximum height that is less than the original height of the ball Questions to ask: • What forces are acting on the ball? (Answer: gravity. friction, the normal force) • Where does the ball reach its maximum speed and acceleration? (Answer: right before it hits the ground) • What is the acceleration of the ball when it is at its peak heights? (Answer: Zero...it's about to change direction 4 Applications 4.1 Tall Tower What happens when you drop a bouncy ball off of a gigantic building, such as the Sears Tower in Chicago (440 m), or the new tallest building in the world, the Burj Khalifa in Dubai (500 m)? Well, some Australian scientists dropped a bouncy ball off of a tall radio tower. The ball actually shattered like glass on impact. 4.2 Sports What sports require knowledge of bouncing balls for their success? (Tennis, cricket, racquetball, baseball, and basketball are a few). -
Competition Schedule
Competition Schedule TUE WED THU FRI SAT SUN MON TUE WED THU FRI SAT SUN MON TUE WED THU FRI SAT SUN LOCATION JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL JUL 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Opening Ceremony Downtown Toronto • Closing Ceremony Downtown Toronto • Aquatics Diving Scarborough • • • • Open Water Swimming Downtown Toronto • • Swimming Scarborough • • • • • Synchronized Swimming Scarborough • • Water Polo Markham • • • • • • • • Archery Downtown Toronto • • • • • Athletics Marathon Downtown Toronto • • Race Walk Downtown Toronto • • Track And Field North York • • • • • Badminton Markham • • • • • • Baseball Ajax • • • • • • • • • • • • • • • • Basketball Downtown Toronto • • • • • • • • • • Bowling Etobicoke • • • • Boxing Oshawa • • • • • • • • Canoe/Kayak Slalom Minden Hills • • Sprint Welland • • • • Cycling BMX Etobicoke • Mountain Bike Oro-Medonte • Individual Time Trial Milton • Road Cycling Downtown Toronto • Track Cycling Milton • • • • Equestrian Dressage Caledon • • • Eventing Caledon • • Eventing (Cross-Country) Mono • Jumping Caledon • • • Fencing Scarborough • • • • • • Field Hockey Downtown Toronto • • • • • • • • • • • • Football (Soccer) Hamilton • • • • • • • • • • • • • • • • Golf Markham • • • • Gymnastics Artistic Gymnastics Downtown Toronto • • • • • Rhythmic Gymnastics Downtown Toronto • • • • Trampoline Downtown Toronto • • Handball Downtown Toronto • • • • • • • • • • Judo Mississauga • • • • Karate Mississauga • • • Modern Pentathlon Scarborough -
Health and Physical Education 1
Health and Physical Education 1 Health and Physical Education Activity Courses Our activity courses provide fun ways for students to improve overall health. Check out the variety of courses available! Group Fitness Aerobics Butts and Guts Workout Weight Training Yoga Sports and Recreation Racquetball Rock Climbing Speed and Plyometrics Swimming Tai Chi Tennis Volleyball Basketball Ballroom Dance Walk/Jog/Run Judo/Jujitsu Karate Kung Fu Ladies' Self-Defense HPE 100 - AEROBICS Semester Hours: 2 Improve cardiovascular fitness, flexibility, muscular strength and endurance, balance, and postural alignment. This class will focus on aerobic activity, specifically in the form of low- and high- impact aerobics. A wide variety of exercises will be included to provide a total-body workout. HPE 105 - CARDIO DANCE Semester Hours: 1-2 HPE 109 - SPEED & PLYOMETRIC TRAINING Semester Hours: 2 HPE 110 - WALK/JOG/RUN Semester Hour: 1 A beginner and intermediate level course with emphasis placed on giving a positive introduction to walking, jogging, and running as a way to enhance fitness and promote weight control, and to provide a viable option for a lifetime fitness activity. HPE 111 - BUTTS & GUTS WORKOUT Semester Hours: 2 HPE 117 - WEIGHT TRAINING Semester Hours: 2 Learn to safely and efficiently use strength training techniques to reach your fitness goals. Develop the skills needed to create a personalized weight training program. HPE 120 - SWIMMING Semester Hour: 1 Learn the basic or progress in your swimming by learning the common swim strokes and techniques. Introduction to conditioning and training and work toward improving skills and endurance bringing higher efficiency in the water. -
2017 Anti-Doping Testing Figures Report
2017 Anti‐Doping Testing Figures Please click on the sub‐report title to access it directly. To print, please insert the pages indicated below. Executive Summary – pp. 2‐9 (7 pages) Laboratory Report – pp. 10‐36 (26 pages) Sport Report – pp. 37‐158 (121 pages) Testing Authority Report – pp. 159‐298 (139 pages) ABP Report‐Blood Analysis – pp. 299‐336 (37 pages) ____________________________________________________________________________________ 2017 Anti‐Doping Testing Figures Executive Summary ____________________________________________________________________________________ 2017 Anti-Doping Testing Figures Samples Analyzed and Reported by Accredited Laboratories in ADAMS EXECUTIVE SUMMARY This Executive Summary is intended to assist stakeholders in navigating the data outlined within the 2017 Anti -Doping Testing Figures Report (2017 Report) and to highlight overall trends. The 2017 Report summarizes the results of all the samples WADA-accredited laboratories analyzed and reported into WADA’s Anti-Doping Administration and Management System (ADAMS) in 2017. This is the third set of global testing results since the revised World Anti-Doping Code (Code) came into effect in January 2015. The 2017 Report – which includes this Executive Summary and sub-reports by Laboratory , Sport, Testing Authority (TA) and Athlete Biological Passport (ABP) Blood Analysis – includes in- and out-of-competition urine samples; blood and ABP blood data; and, the resulting Adverse Analytical Findings (AAFs) and Atypical Findings (ATFs). REPORT HIGHLIGHTS • A analyzed: 300,565 in 2016 to 322,050 in 2017. 7.1 % increase in the overall number of samples • A de crease in the number of AAFs: 1.60% in 2016 (4,822 AAFs from 300,565 samples) to 1.43% in 2017 (4,596 AAFs from 322,050 samples). -
Striking Results with Bouncing Balls
STRIKING RESULTS WITH BOUNCING BALLS André Heck, Ton Ellermeijer, Ewa K ędzierska ABSTRACT In a laboratory activity students study the behaviour of a bouncing ball. With the help of a high-speed camera they can study the motion in detail. Computer modelling enables them to relate the measurement results to the theory. They experience that reality (measurements) is not automatically in line with the predictions of the theory (the models), but often even strikingly apart. This stimulates a process of repeated cycles from measurement to interpretations (how to adapt the model?), and in this way it realizes a rich and complete laboratory activity. The activity is made possible by the integrated ICT tools for measurements on videos made by a high-speed camera (via point-tracking), and for modelling and simulations. KEYWORDS Video recording and analysis, computer modelling, simulation, animation, kinematics, bouncing ball INTRODUCTION Each introductory physics textbook, already at secondary school level, illustrates Newton’s laws of motion and concepts of gravitational energy and kinetic energy with examples of objects dropped or thrown vertically and contains investigative activities about falling objects. The reasons are obvious: o the physics and mathematics is still simple enough to be accessible to most of the students; o an experiment with a falling object, in which data are collected with a stopwatch and meter stick, using sensors such as a microphone or a sonic ranger (MBL), or via web cams and video analysis tools (VBL), is easy to perform; o it is a clear invitation to compare measurements with theoretical results. Falling with air resistance is a natural extension of a free fall study. -
The First Beautiful Game
THE FIRST BEAUTIFUL GAME Stories of obsession in Real Tennis Roman Krznaric Ronaldson Publications September 2006 CONTENTS Introduction The Wordless Conversation From Abbots to Zealots Life in Court Serving to Gentlemen The Missionary Adventures With My Father References Acknowledgements About the author Notes 2 INTRODUCTION Bent rackets, hand-sewn balls and netted windows. Painted crowns, brass bells and penthouses. Chases, railroads and giraffes. Welcome to the curious world of real tennis. Originating in medieval Europe, the court, rules and equipment have hardly changed in four centuries. Yet this book is not a chronicle of its history, nor is it a manual on technique and strategy. It is about the players and their obsession. Over the past five years I have spoken with real tennis players about their experiences of the sport, why they play and what it means to them. I learned that most of them are fanatics, some are addicts. More than a few are eccentrics. And I found their stories revealing about the art of living: whether to pursue our passions and ambitions, how to balance work and personal life, why we need respect and equality, where we can find and create beauty. This book tells those stories in their own voices. I should admit that I am one of the fanatics, an amateur player who has named three bicycles and a car after former World Champions. I first encountered real tennis in the late 1980s when a student. At the time I was dedicated to another sport that, in my ignorance, I called ‘tennis’ – the game played at Wimbledon and in parks on sunny afternoons.