Inside the Lab – C Make sure you do these activities only with the help of a teacher or an adult. Activity C1: Simple Machine We have learnt that simple machines help us to do different types of work easily. Let us make a simple machine using some pencils. Let us also find out how they make the work easy. You will need: one brick per group, 10 pencils per group You need to: 1) divide the class into groups of four. 2) a sk a student from each group to push a brick across the floor or a stone slab. Is it an easy task? 3) a sk each group to take 10 pencils. How could you move the brick more easily using the pencils? Take group members’ suggestions. 4) p ut the pencils under the brick and roll it across the pencils. Was it easier this time? 5) m ove other things such as books in the same manner. See if there is a difference. Find out how people in the olden times may have used this simple machine to move big objects. Activity C2: Catapult A catapult is a simple machine used to throw stones or any object. Let us make a simple catapult using some easily available materials. Let us also find out how they help us to throw stones easily. You will need: nine craft sticks or ice cream sticks, six good quality rubber bands, one plastic spoon NR_BGM_9789388751322 PASSPORT G05 EVS I TEXTBOOK PART 2_Text.pdf 51 47 12/15/2018 11:52:32 AM
You need to: 1) t ake seven craft sticks, and tie one rubber band each tightly around two ends to bound them all together. 2) take two sticks, and tie a rubber band on one of the ends. Try to tie the rubber band close to the edge of the sticks. 3) insert the stack of seven sticks through the two stick bundle. 4) tie these two pieces with a rubber band in a cross fashion as shown in the given image. 5) u se few rubber bands, and attach the plastic spoon at the open end of the two sticks. 6) try catapulting pebbles or other small objects. 48 12/15/2018 11:52:32 AM NR_BGM_9789388751322 PASSPORT G05 EVS I TEXTBOOK PART 2_Text.pdf 52
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