![]() Note that while the units are Nm, we don't call them Result is positive, indicating that the angular acceleration isĬounterclockwise. Substituted and the value of the net torque is solved for. The expressions obtained above for moment arm are Τ 1 and τ 2 represent the magnitudes of the torques. Negative (positive), because it tends to produce clockwise The moment arm of F 2 is opposite the angle β, which is Perpendicular to the line of application. The line of application of F 1 has been extended so that the moment arm of the force can be drawn Needed, but we're providing a second one for clarity.)ĥ. See the supplementary diagrams to the right for how the angles are determined.Īngles in the next diagram. The angle through which the position vector rotates into the force The forces are drawn extending from points P and Q. Which way the net torque accelerates the disc.Ģ. Determine the net torque on the disc about its center and Radial line extending from the axis through the point of application P of A second force of magnitude 15 N isĮxerted at a distance of 0.26 m from the axis and at an angle of 119° from a Magnitude 11 N is exerted at a distance of 0.34 m from the axis and at anĪngle of 58° from a radial line extending from the axis through the point ofĪpplication Q of the force. A circular disc is rotated about anĪxis O through its center by the application of two forces. Whether the angular acceleration due to the net torque is clockwise orĮxample. Tending to produce counterclockwise are +. Give each torque the correct sign according to the convention that torques This may require extending the line of application of Of the angle is used in the calculation of the moment arm. Be sure to identify it correctly, because the sine The angleīetween the two vectors is the one you want. Right hand from the position vector to the force vector. In order to determine the correct angle, imagine r and F starting from the same point and curl the fingers of your Net force problems, it is important for net torque problems.)Įxtending from the axis of rotation to the points of application of each Show on a diagram the axis that you select.įrom their points of application. We start with a method for calculating net torque and then show how to solve for the angular acceleration.Ĭalculating Net Torque Here are important things to do in calculating net torque. For net torque problems, you have to indicate whether a torque tends to produce clockwise or counterclockwise rotation. You solve for force components along each axis.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |