7. Two pieces equipment in tennis In order to compete in a tennis match, one must only possess tennis balls and a tennis racquet. There are other pieces of equipment that are good too have, like comfortable and flexible apparel and proper tennis shoes, but the racquet and tennis ball are the only two necessities. http://www.tennisequipmentusa.com/prodimages-cdls/Logos/ArtShots/TennisEquipmentUSA.art.jpg http://www.athleticscholarships.net/sports-equipment-tennis.htm
8. The evolution/history of tennis racquet The tennis racquet was first introduced in the 11th or 12thcentury. By the 14th century players began using actual racquets that were made of wood and string made of guts. Over the next 100 years wood racquets continued to improve, but stayed heavy and had smaller heads. Metal heads for racquets showed up in the late 1800s, and have become better through the years, being more light weight, larger, increased flexibility, and easier to maneuver. Today just about all racquets are made of materials like aluminum, graphite, or others that relate because they are stronger and lighter than wood, and handles are generally covered with a grip of leather or rubber. http://t3.gstatic.com/images?q=tbn:pW1z78Wpd7xllM:http://www.bbc.co.uk/wales/raiseyourgame/images/446x251/tennis_racquet_446x251.jpg http://www.athleticscholarships.net/sports-equipment-tennis.htm
9. how does Polymer improve tennis racquet? Polyurethane (PU) is a common plastic found in tennis rackets. Foamed PU is injected into the racket handle to act as a damping material. It is also used to make grips and to coat natural gut strings. http://t1.gstatic.com/images?q=tbn:5DK1NE3vvbqgUM:http://www.newaystore.com/images/Tennis/N.JPG http://www.itftennis.com/technical/questions/glossary.asp#P
10. The evolution/history of tennis ball In 1986 the Championships adopted yellow tennis balls for the first time. Tennis balls have a uniform outside surface and usually have stitchlessseams. The color of a tennis ball is always yellow or white and the size is between 2 1/2 inches and 2 5/8 inches in diameter. The ball’s weight can range from 2 ounces to 2 1/6 ounces. http://www.athleticscholarships.net/sports-equipment-tennis.htm http://www.collegesportsscholarships.com/tennis-history-clubs.htm http://imagecache2.allposters.com/images/SSPOD/SuperStock_1321-303.jpg
11. How does Polymer improve tennis ball? Natural polymers from plants and animals also find application in both rackets and tennis balls. Natural gut string is made from the outer skin of cows’ intestines, known as serosa (also made up of collagen) and natural rubber (polyisoprene) is used in tennis ball cores. http://www.itftennis.com/technical/questions/glossary.asp#P http://www.novakdjokovic.eu/images/tennis2.jpg
12. Polymers were important in the construction of football field/outdoor track (other field) The channels are made of high strength polymer concrete. This material is extremely durable and superior in strength when compared to portland cement concrete. Polymer concrete is nonabsorbent and resistant to freeze -thaw cycles. http://www.sportsfieldspecialties.com/index.php?option=com_content&view=article&id=20&Itemid=41 http://www.mpc.edu/mpcbond/MPC%20Community%20Stadium/A8%20football%20field.JPG
![Different types of equipment use in tennis ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)