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Balancing Doll | How does it work? | English
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In this video you will learn some interesting facts about a balancing doll and learn the concept of center of mass. This concept plays a crucial role in a lot of balancing objects and we’ll see how they work!
If we try to balance just the doll on our fingertip, it’s not possible and it keeps falling down. But on attaching two hands to the doll with equal weights fixed at the end, you can easily balance the doll on your fingertip. So what’s happening here?
Here the doll and two attached weights make a triangle. The centroid of this triangle is the center of mass of entire system. So if the doll is pivoted above the center of mass, then it will not fall and can maintain the balance. If we make the doll tilt on one side and let go, then the doll suddenly rises up and maintains the balance once again. We can also place the doll on the tip of a rod and the doll can rotate as the pivot point is above the center of mass.
This activity can also be experienced by blind students. Attach two hands with equal weights to the doll on both sides. A pulley is attached to the base of the doll which allows it to roll on a rope. Now ask the blind student to hold one end of the rope. By keeping the rope slightly inclined, the doll can be made to slide on the rope. The doll will slide on the rope without falling as the center of mass is below the pivoting point (which is the rope in this case). While holding the rope blind student can feel the vibrations and will get the idea that something is rolling on the rope. This allows them to understand how the whole experiment is taking place.
We hope you liked this activity and will try to make simple toys that can balance on small points. For more such hands on activities visit our You Tube channel: IISER Pune Science Activity Centre. Have Fun!
Production team: Ashok Rupner, Chaitanya Mungi, Shraddha Bhurkunde, Neha Apte
Prof. B. D. Chakradeo, Mukund Mehendale, Yash Bharambe,
Camera: Vivek Kannadi, Parmeshwar Singh Yadav Music: Dr. Manasi Kulkarni
If we try to balance just the doll on our fingertip, it’s not possible and it keeps falling down. But on attaching two hands to the doll with equal weights fixed at the end, you can easily balance the doll on your fingertip. So what’s happening here?
Here the doll and two attached weights make a triangle. The centroid of this triangle is the center of mass of entire system. So if the doll is pivoted above the center of mass, then it will not fall and can maintain the balance. If we make the doll tilt on one side and let go, then the doll suddenly rises up and maintains the balance once again. We can also place the doll on the tip of a rod and the doll can rotate as the pivot point is above the center of mass.
This activity can also be experienced by blind students. Attach two hands with equal weights to the doll on both sides. A pulley is attached to the base of the doll which allows it to roll on a rope. Now ask the blind student to hold one end of the rope. By keeping the rope slightly inclined, the doll can be made to slide on the rope. The doll will slide on the rope without falling as the center of mass is below the pivoting point (which is the rope in this case). While holding the rope blind student can feel the vibrations and will get the idea that something is rolling on the rope. This allows them to understand how the whole experiment is taking place.
We hope you liked this activity and will try to make simple toys that can balance on small points. For more such hands on activities visit our You Tube channel: IISER Pune Science Activity Centre. Have Fun!
Production team: Ashok Rupner, Chaitanya Mungi, Shraddha Bhurkunde, Neha Apte
Prof. B. D. Chakradeo, Mukund Mehendale, Yash Bharambe,
Camera: Vivek Kannadi, Parmeshwar Singh Yadav Music: Dr. Manasi Kulkarni
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