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FRICTION 157Extended Learning %u2014 Activities and Projects1. What role does friction play in the sport of your choice? Collectsome pictures of that sport in action where friction is eithersupporting it or opposing it. Display these pictures with propercaptions on the bulletin board of your classroom.2. Imagine that friction suddenly vanishes. How would the life beaffected. List ten such situations.3. Visit a shop which sells sports shoes. Observe the soles of shoesmeant for various sports. Describe your deservations.4. A toy to play with:Take an empty match box. Take out its tray. Cut a used refill of a ballpen of the same width as the tray as shown in the figure below. Fixthe refill with two pins on the top of the tray as shown in Fig. 12.18.Make two holes on the opposite sides of the tray. Make sure that theholes are large enough to allow a thread to pass through them easily.Take a thread about a metre long and pass it through the holes asshown. Fix beads at the two ends of the thread so that it does notcome out. Insert the tray in the outer cover of the matchbox. Suspend the match box by the thread. Leave the thread loose.The match box will start falling down due to gravity. Tighten thethread now and observe what happens. Explain your observation. Can you relate it to friction?Fig. 12.18You can read more on the related topic on the following websites :%u0001 http://www.school-for-champions.com/science/friction.htm%u0001 http//hyperphysics.phy-astr.gsu.edu/hbase/firct2.html%u00a9 NCERTnot to be republished