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Describe how the magnitude of a torque depends on the magnitude of the lever arm and the angle the force vector makes with the lever arm; Determine the sign (positive or negative) of a torque using the right-hand rule; Calculate individual torques about a common axis and sum them to find the net torque
Describe torque and lever arm; Solve problems involving torque and rotational kinematics
The symbol for torque is the lowercase Greek letter tau, . F is the force causing the torque. The equation is sometimes given as !τ = ! ! r⊥F. ! ! ! • is called the “moment arm” or “lever arm” and r⊥ r⊥ = rsinθ. ! r is the position vector from the axis of rotation to where the force is applied to the object.
A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force.
The Torque Concept Builder focuses attention upon the variables that affect the amount of torque, the direction of rotation caused by a torque, the +/- sign of torque, and the meaning of lever arm.
Torque. A torque is an influence which tends to change the rotational motion of an object. One way to quantify a torque is. Torque = Force applied x lever arm . The lever arm is defined as the perpendicular distance from the axis of rotation to the line of action of the force.
Torque is introduced via the equation and several door opening demonstrations. Moment arm or lever arm is defined and illustrated. This is an AP Physics 1 topic. Content Times: 0:06 Translational and Rotational Motion. 0:58 Defining Torque. 1:53 The torque equation. 2:59 Door example #1.
