A 30kg boy is swinging on a park swing. The swing's 2 chains are each 3m long. For one particular swing, he is going at 6m/s at the bottom of the swing.

a) Draw a free body diagram for the forces at the moment he is at the bottom of the swing

b)Find tension force in each chain at the bottom of the swing.

The answer to b is 330 N, and i see how he got there, but I don't understand why...

Question

A 30kg boy is swinging on a park swing. The swing's 2 chains are each 3m long. For one particular swing, he is going at 6m/s at the bottom of the swing.

a) Draw a free body diagram for the forces at the moment he is at the bottom of the swing

b)Find tension force in each chain at the bottom of the swing.

The answer to b is 330 N, and i see how he got there, but I don't understand why...