Lever arm (moment arm):
Fulcrum: Pivot: Line-of-action: Rotational Equilibrium: Concurrent forces: Non-concurrent forces: Rigid-body statics problem: Mathematical Fulcrum: Physical Fulcrum: Seesaw problem: Ladder problem: Bonus word: “couple” : |
The perpendicular distance between the line of action of a force and a pivot; is the "effective distance" from the point of force to the axis of rotation
The support about which a lever pivots on the point of rest. The pivot (below) sits on top of the fulcrum. The point where a moving object rotates around an axis. The line at which F force is applied and the direction of which force is applied. This is important to understand in order to better understand the net effect on multiple forces applied to a body. When the sum of torques equal zero and object moves with constant angular velocity Concurrent forces are forces that have a constructive influence on another force, meaning that when you add the components of the two forces, the net force is greater than either of the initial forces. Forces that all act on one specific point. Opposite to Concurrent forces which do not put the force on one specific point. A body that does not deform. This means that external forces act upon the particles in the body, but the distance between the particles does not change. Force (F) multiplied by the Force Arm (Af) is equal to the Resistance ® multiplied by the Resistance Arm (Ar). - F * Af = R * Ar A physical support that lifts a lever or another physical object. A simple example of two equilibrium positions. One side is stable and the other is not. Ladder problems are examples of objects in static and rotational equilibrium. Ladder problems can be affected by Torque. A system of forces with a resultant moment but it does not have a resultant force. It is sometimes called a ‘pure moment’. The resultant moment from the couple is what Torque is. |
Vocabulary
On this page you can find Vocabulary on Torque. These terms help to determine what Torque is.