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# Balancing act on see saw by Power point

Training Lesson

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### Balancing act on see saw by Power point

1. 1. Balancing act on see- saw Objectives  Students investigate the center of mass (gravity) of an object by experiment.  Students explain the reason why see-saw is balanced (or clockwise torque is equal to the counter-clockwise torque) by experiment.
2. 2. Balancing act on see-saw Demonstrate to find the center of mass of 1-m ruler.
3. 3.  Center of mass Balancing act on see- saw Center of mass there is place where net torque acting on the body is zero. Center of mass (gravity) is the point where all of the mass of the object is concentrated. Center of mass (gravity) is a place where it divides masses into two parts equally. Why do you think so???
4. 4. Balance of see-saw Balancing act on see- saw See-saw makes balance then the mass from each side time its distance from pivot equals each other. See-saw makes balance then the masses at the both side of pivot equal each other. See-saw makes balance then the clockwise toque equals to the counter-clockwise toque. Why do you think so???
5. 5. Procedures Balancing act on see- saw Find the enter of mass Find the balance of see-saw Mark
6. 6. Results Balancing act on see- saw Get g = 10 N/kg Length d1= (cm) d = (cm), d2 = d/2 = (cm) Weight m1 = (g) m2 = (g) Torque 1 = 2 (m1 d1 g = m2 d2 g) m1 d1 = (g cm) = (kg m) m2 d2 = (g cm) = (kg m) 1 = 2 = (Nm)
7. 7. Simple calculation Balancing act on see- saw show your work •m1 d1 = •m2 d2 = •1 = m1 d1 g = •2 = m2 d2 g =
8. 8. Conclusions Balancing act on see- saw • Center of mass (gravity) is the point where all of the mass of the object is concentrated or is place where net torque acting on the object (body) is zero. •The see-saw makes balance then the clockwise toque equals to the counter clockwise toque. These can be found easily by experiment.
9. 9. Do it more! • For the uniform rod or ruler •For uniform ring and hollow cylinder C
10. 10. Thank you so much!