1. Think about it. What would you do?
2. No motion; no torque
3. What do you think? Watch one sometime.
4. Tell me what the "second condition for equilibrium" is first.
2.Two children are sitting on the see-saw,such that they can not swing.What is the net torque in this situation?
3.Does the speed of a ceiling fan go on increasing all the time?
4.Does the ceiling fan satisfy second condition for equilibrium when rotating with uniform speed?
2. No motion; no torque
3. What do you think? Watch one sometime.
4. Tell me what the "second condition for equilibrium" is first.
As we know that:
Sum of clockwise moments= Sum of anti-clockwise moments of equilibrium.
So,the distance from the pivot of the seasaw should be increased for the small child so that the moment of force or torque is increased.
According to principle of moments sum of clockwise moments=sum of anticlockwise moments for a system or body to be balanced .the fat child has larger weight so he should be near to the pivot (there will be shorter moment arm ) whereas the small child should be further away from seasaw( there will be longer moment arm ). In this way system will be balanced and they can play sea saw . I hope this helps you:)