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Forces that create a moment act around a point called the pivot. The pivot is the point around which the object can rotate or turn. On a seesaw the pivot is the point in the middle.
The lever arm is the vector from the point of rotation (pivot point or fulcrum) to the location where force is applied. Since the magnitude of the lever arm is a distance, its units are in meters, and torque has units of N⋅m.
Torque has both magnitude and direction. (a) A counterclockwise torque is produced by a force →F acting at a distance r from the hinges (the pivot point). (b) A smaller counterclockwise torque is produced when a smaller force →F′ acts at the same distance r from the hinges.
To develop the precise relationship among force, mass, radius, and angular acceleration, consider what happens if we exert a force F F on a point mass m m that is at a distance r r from a pivot point, as shown in Figure 10.4.2.
In one frame of reference, the mathematical form of the equilibrium conditions may be quite complicated, whereas in another frame, the same conditions may have a simpler mathematical form that is easy to solve. The origin of a selected frame of reference is called the pivot point.
Torque and Rotational Motion Tutorial. What is Torque? Torque is a measure of how much a force acting on an object causes that object to rotate. The object rotates about an axis, which we will call the pivot point, and will label ' O O '. We will call the force ' F F '.
Draw a line from where the force is applied to the pivot point (Figure 2). If the force acts in a direction which is at right angles to this line, we can call the distance between the pivot point and the point at which the force acts the perpendicular distance.
