Suppose you are on a teeter-totter. Use the concept of net force to explain why one person goes up when the other person goes down. What needs to happen for the teeter-totter to be balanced?

The mystery behind the see-saw motion lies in force and genesis of counterforce.

Balanced Teeter totter can be achieved by placing equal masses or length adjustment (betwen pivot and mass) for varying mass.

Explanation:

Teeter totter is a wonderful manifestation of physics principles in crude form.

The working of Teeter totter can be explained as-

The whole set-up (Teeter totter) is balanced on a pivot or fulcrum. When either of its edges/sides is loaded, it moves down under the impact of its mass & gravity (force=m*gravity).  

Equal and opposite counterforce acts on the other end of the Teeter totter to balance the effect of the previously applied force. As a result of this, the other side is raised upwards in the air.

As a result of this the net force remains balanced on either side (considering similar masses are on both ends of the Teeter totter)

For a Teeter totter to be balanced there are two conditions-

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation: