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What is torque? Crudely speaking, torque is "twisting or turning ability" of a force that can: change the angular velocity of an object (i.e. speed up or slow down rotation) cause a twisting or bending distortion of an object. A force with a "line of action" that does not cross the axis of rotation results in torque. Note:
Two ways to compute torque: 1. Put r and F vectors tail-to-tail and compute t = rFsinq. 2. Decompose F into components parallel and perpendicular to r, and take: t = rF ┴ If rotation is clockwise, torque is negative, and if rotation is counterclockwisetorque is positive. Note: If F and r are parallel or antiparallel, the torque is 0.
Torsion. Learning Objectives. 6.1 Formulation of the basic equations of torsion of prismatic bars (St. Venant) Readings: Sadd 9.3, Timoshenko Chapter 11. e2. 1. e3. Figure 6.1: Torsion of a prismatic bar. We will employ the semi-inverse method, that is, we will make assumptions as to the.
A positive torque is one that causes an object in the x-y plane to rotate in the counter-clockwise direction, while negative torques are those the cause an object to rotate in the clockwise direction. clockwise motion (- ) ! negative torque. counter-clockwise motion (+ ) ! positive torque.
Physics 101: Lecture 14, Pg 7 Torque Example and ACT A person raises one leg to an angle of 30 degrees. An ankle weight (89 N) attached a distance of 0.84 m from her hip. What is the torque due to this weight? 1) Draw Diagram 2) t = F r sin q = F r sin(90 – 30) If she raises her leg higher, the torque due to the weight will A) Increase B) Same
Another commonly used unit is the foot-pound (ft-lb), which is the torque produced by a one-pound force applied at a distance of one foot. In addition to these primary units, other units of torque are also used in specific contexts.
We have three methods for calculating torque about a particular point. R θ Force acts here. F Force acts here. R Force acts here. Use this method if both R and θ are easy to find. Use this method if the lever arm is easy to find. Use if Rr and Fr are easy to break into components.
