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# TORQUE DEFINED - PowerPoint PPT Presentation

TORQUE DEFINED. a Force applied a system restricted to moving in a circular path causes a system/body to rotate the Point of Application is eccentric T = F x FA . MUSCLE TORQUES. Magnitude - product of F x FA Direction - angle of pull on bone Line of Action - vector direction

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• a Force applied a system restricted to moving in a circular path

• causes a system/body to rotate

• the Point of Application is eccentric

• T = F x FA

• Magnitude - product of F x FA

• Direction - angle of pull on bone

• Line of Action - vector direction

• Point of Application - attachment to bone

• shortest distance from axis of rotation to the line of action of the applied Force

• (perpendicular) to line of action

• Axis of Rotation

• 2 Forces

• 2 Force Arms

FIG 9-30 page 296

“Basic Biomechanics”

4th Edition

Susan J. Hall

• T = F x FA

• F is board reaction

• FA is d 

• t is board recoil time

p. 328 in course text

• Force measured in Newtons [4.45N = 1Lb.]

• Force Arm measured in meters

• Torque measured in Newton meters [Nm]

• FIG E.11 page 118

• sum up all Torques on each side of axis

• side of axis with the larger  of T determines direction of movement

• there are both kinetic and kinematic vectors

• A vector is represented by a straight line arrow symbol

• the length of the arrow is the magnitude

• the orientation of the arrow is the direction

• to get a straight line vector for angular motion, the right hand thumb rule is used

• method of determining vector direction for angular motion

• curve fingers of right hand in the direction of the Torque

• right thumb points in vector direction of the motion, to the actual direction of the spin

Right-Hand Thumb points in vector direction

FIG 15.9on page 506

FIG 15.10on page 507

See course text

FIG E.21 on page 127

FIG E.22 on page 127

• C of B is the location of the C of G of the volume of water displaced by a immersed body

• There is no T (torque) when the person’s CB is aligned with her/his CG

• When CB is co-linear with CG, the body will float and not rotate