Question

A wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces at 16 º angle on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 19.5 N, what is the magnitude of the net force exerted on the tooth by these forces?

Answer 1

2•T•sinφ=2•19.5•sin16º=10.75 N

Answer 2

The topmost tooth is protruding slightly, and the tension in the wire exerts two forces T and T’ on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 21.0 N, what is the magnitude of the net force exerted on the tooth by these forces?