Physics Properties Of Matter Level: High School


A stinless steel orthodontic wire is applied to a tooth that is out of line by 21 degree . The wire has an unstretched length of 4.5 cm and a diameter of 0.21 mm . If the wire is stretched 0.1 mm . find the magnitude of the force on the tooth . (Disregard to the width of the tooth). Young’s modulus for stainless steel is 1.8 x 10^11 Pa . Answer in units of N .