Definition of a Torque

Definition of a Torque - Definition of a Torque When we...

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Definition of a Torque When we studied translational motion, a given force applied to a given particle always produced the same result. Because in rotational motion we consider rigid bodies rather than particles, we cannot make such a general statement about the effect of an applied force. For example, if the force is applied to the center of the object, it will not cause the object to rotate. If, however, it is applied to the edge of a rotating object, it can have quite a large effect on the rotation of the object. With this aspect of rotational motion in mind, we define torque to generally describe the effect a force will have on rotational motion. Consider point P a distance r away from an axis of rotation, and a force F applied to P at an angle of θ to the radial direction, as shown below. Figure %: A force acting at angle θ to the radius of rotation of point P If the force is parallel to the radius of the particle ( θ = 0 ), then the force might cause some translational motion of the particle. But, since the force has no component acting in the
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This note was uploaded on 02/09/2012 for the course PHY PHY2053 taught by Professor Davidjudd during the Fall '10 term at Broward College.

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Definition of a Torque - Definition of a Torque When we...

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