Search

Copyright of Coaching & Sport Science Review is the property of International Tennis Federation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coaching & Sport Science Review is the property of International Tennis Federation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Data from men's singles at the four Grand Slam events is presented to show how the game has been changing over the last ten years or so. The biggest change has been the increase in serve speed at the French Open. The average first serve speed is now about the same at all four events. Serve speed continues to increase at all events, as does the number of aces, while the number of double faults is decreasing. It is clearly harder to serve an ace on clay, despite the comparable serve speeds. Data is also presented on the % of tie-break sets, games per set and points per game. [ABSTRACT FROM AUTHOR]

The article presents an experiment which analyzed the concept of aerodynamics using party balloon. It explains the principle of the Magnus force on a spinning balloon, along with the concept of buoyant and drag force. It details the procedures used to investigate the Magnus force on a spinning balloon. It also describes the aerodynamics in party balloon.

Mahajan[1] used such calculations to predict that a 100 lb iron ball dropped from a height of 50 m would hit the ground about 10 m ahead of a 1 lb ball. Second, an 80 cm difference corresponds to a time difference of only 0.025 s when the balls hit the ground at about 31 m/s. I doubt that anyone could drop two balls simultaneously within that time frame, and at zero speed, using hand-eye coordination alone. In the present case, a reasonable approximation might be to assume that each ball collides with a small fraction of the air ahead of it, given that most of the air sneaks around the back of the ball rather than being projected forward. [Extracted from the article]

The article discusses the physical laws involved in of chalk into three pieces when it falls on the ground. Topics discussed include slow motion video of chalk, impact of the fall of chalk leading to two resultant effects, and bending stress involved in breaking mechanism of chalk. The effects of the impact of the fall are illustrated in the image.

The purpose of this study was to examine the accuracy of methods to estimate ball spin rate and spin axis direction using multi-camera tracking technology. The method implemented by Hawk-Eye and a theoretical ball trajectory model were assessed for their accuracy against high speed-vision. A theoretical ball trajectory model was found to estimate ball spin rate and the spin axis direction more accurately than the method used by Hawk-Eye. The superior performance of the ball trajectory model was indicated by a lower mean bias and standard deviation (2.92 ± 222.76) than Hawk-Eye (−100.01 ± 542.44), as well as narrower limits of agreement and a 327.63 RPM lower RMSE. Spin rates less than 4500 RPM were estimated with the highest accuracy, but neither method was able to consistently and accurately estimate spin rates >4500 RPM. The application of a trajectory model to multi-camera ball tracking data provides a practical and non-invasive method to accurately estimate the spin imparted when hitting, allowing for large-scale collection of spin rates during matches. [ABSTRACT FROM AUTHOR]

The article discusses the study titled "Impulse and work for the bullet-block Veritasium video," by C. E. Mungan which noted the conversion of translational energy into gravitational potential energy. It states that gravitational potential energy can be converted from translational energy when an object is projected vertically as rotational energy cannot be converted in this manner. Particular focus is also given to the correlation between rolling friction and ball diameter.

The article discusses the spinning disk demonstration given by professor Eric Laithwaite using a gyroscope. Topics include the forces action on the gyroscope while it spins, the precession frequency, and a modern version of the demonstration conducted by science communicator Derek Muller. The video of both demonstrations is available on online video sharing site YouTube.com.

The article offers information on an experiment conducted to study the causes of rotational movements of the curved-shaped physics toy rattleback. It informs that the placement of a metal strip at each end of rattleback causes vertical axis rotation of rattleback due to the produced torque. The experiment concluded that an object can roll without sliding and yet will experience a heavy friction force.

The article offers information regarding the construction of spherical tippe tops. It mentions that physicists Wolfgang Pauli and Niels Bohr demonstrate the mystery of inversion of a tippe top. It informs that center of mass is an important feature of tippe top. It further informs about the construction of spherical tippe top by three-dimensional (3-D) printing.

The article presents a science experiment describing the phenomena made popular by scientist Isaac Newton's cradle, conducted by scientist Edme Mariotte around 1970. A, B, C be three identical balls of ivory or other hard material are used in the experiment. The three balls A, B, and C, themselves do not touch and when ball D strikes ball C, it will transfer its speed to C and come to rest giving its speed to ball B, and hence to ball A.

The article presents a study which examines the launch speed of an airborne vehicle from a ramp and its association with the concept of physics. It says that a toy vehicle has been used to understand its physics and to study the vehicles' rotation, projectile motion, and safety awareness of the driver. A simple trajectory calculation reveals that the vehicle's launching speed has reached 24 kilometers per hour (km/h) while its rotation angle is approximately 80°.

The objective of this paper is to use data from the highest level in men's tennis to assess whether there is any evidence to reject the hypothesis that the two players in a match have a constant probability of winning each set in the match. The data consists of all 4883 matches of grand slam men's singles over a 10 year period from 1995 to 2004. Each match is categorised by its sequence of win (W) or loss (L) (in set 1, set 2, set 3,...) to the eventual winner. Thus, there are several categories of matches from WWW to LLWWW. The methodology involves fitting several probabilistic models to the frequencies of the above ten categories. One four-set category is observed to occur significantly more often than the other two. Correspondingly, a couple of the five-set categories occur more frequently than the others. This pattern is consistent when the data is split into two five-year subsets. The data provides significant statistical evidence that the probability of winning a set within a match varies from set to set. The data supports the conclusion that, at the highest level of men's singles tennis, the better player (not necessarily the winner) lifts his play in certain situations at least some of the time. Key PointsUsing grand slam men's singles data, the probability of winning a set has been shown to vary from set to set.The data provides statistical evidence that the better player (not necessarily the winner) in some matches is able to lift his play in certain situations. This result gives encouragement to the better player when in difficulties in a match.The authors found no evidence that the weaker player was able to lift his play. The weaker player, when ahead in a match, should be on his guard for his opponent to have a real capacity to lift his game.