How to calculate force by moment
the distance from the fulcrum of the lever to the straight line representing the force is called the arm of force. The arm of force is represented by a dotted line, which is not necessarily above the lever, and the moment is the force multiplied by the arm of force
levers can be divided into labor-saving lever, laborious lever and equal arm lever. Labor saving lever is labor saving, but it costs a lot of distance; Hard lever is hard, but it saves distance; And the equal arm lever, the two arms of force are equal, neither labor-saving nor laborious
I hope I can help you.
(1) the driving force can be calculated by the following formula: driving force = torque × Gear ratio of gearbox × Speed ratio of final drive × Mechanical efficiency ÷ The tire radius
(2) the calculation force can also be calculated according to: force F × Radius r = torque, calculated
2, torque: it is a kind of special torque that makes the object rotate. Engine torque refers to the engine torque output from the crankshaft end. When the power is fixed, it is inversely proportional to the engine speed. The faster the speed is, the smaller the torque is, and vice versa. It reflects the load capacity of the vehicle in a certain range. The external torque is called torque or external force couple moment, and the internal torque or internal force couple moment.
-
moment: the proct of force and arm of force is called the moment of force to rotation axis. That is: M = f * l
-
where m is the moment of force F on the rotation axis O. the moment that causes the object to rotate in anti clockwise direction is defined as positive moment, and vice versa as negative moment
-
unit: in the international system of units, the unit of moment is Newton * meter, abbreviated as Newton * meter, and the symbol is n * M
-
in physics, torque refers to the tendency that the force makes the object rotate around the rotation axis or fulcrum. The unit of moment is Newton meter. The Greek letter is tau. The concept of moment originated from Archimedes' study of lever. Rotational torque is also called torque or torque. Torque can change the rotational motion of an object. Pushing or pulling involves forces, while torsion involves moments. The moment is equal to the cross proct of the radial vector and the applied force
-
the physical quantity of the rotation effect of the moment of force on the object. It can be divided into moment of force to axis and moment of force to point. That is: M = lxf. Where l is the distance vector from the axis of rotation to the point of force and F is the vector force; The moment is also a vector
-
the moment of a force on an axis is the physical quantity of the rotation action of a force on an object about an axis, which is equal to the proct of the component of the force on the plane perpendicular to the axis and the vertical distance from the action line of the component to the axis. For example, when opening the door, the external force F is parallel to the component force F of the door shaft П There is no turning effect on the door (Fig. 1) because the force is balanced by the constraint of the fixed axis (see Constraint). The force that can rotate the door is the component force F ⊥ of F in the plane perpendicular to the door axis, and its value f ⊥ is fcos α Make a plane perpendicular to the axis from the action point a of F П， Intersects the axis at point o. According to the experiment, the rotation effect of force F on the object is proportional to the vertical distance L from O to f ⊥. L is called the force arm of F ⊥ to the axis, which is equal to rsin β， Where r = OA; β It's the angle between F ⊥ and OA. Therefore, the rotation effect of force F on the object is determined by fcos α And rsin β This physical quantity is called the moment of force F on the axis, which is an algebraic quantity. When α= 0 ° and β= ninety ° Therefore, in order to improve the rotation efficiency, the force F should be in the vertical plane of the axis and perpendicular to the connecting line OA. If the force F is in the vertical plane of the axis (Fig. 2), the moment of the force to the axis is rfsin β This quantity can also be expressed as twice the area of △ OAB, where AB = F{ RRRRR}
(for reference)
The moment of a force on an axis is the physical quantity of the rotation action of a force on an object about an axis. Its magnitude is equal to the proct of the component of the force on the plane perpendicular to the axis and the vertical distance from the line of action of the component to the axis
the moment of a force to a point is the physical quantity of the rotation action of a force to an object around a certain point, which is equal to the vector proct of the position vector of the force action point and the force vector. For example, an object fixed at point o with a spherical hinge is subjected to the action of the instantaneous force F. the action point of F is a, R is the position vector of a, and the angle between R and F is α
if the object is at rest, it will rotate along a plane perpendicular to R and F and through the instantaneous axis of point O after the force F is applied. The magnitude of rotation is determined by rfsin α Expression
extended data
difference between force and moment
force is the action of an object on an object
2. Different units
unit of moment: n · m
unit of force: n
Moment can not be converted into force, but also need a force arm
the moment is represented by m, the force is represented by F, and the arm of force is represented by L. then M = fl
The moment is equal to the proct of force and arm of force In physics, torque refers to the tendency that the force makes the object rotate around the axis of rotation or fulcrum. The unit of moment is Newton meter. The Greek letter is tau. The concept of moment originated from Archimedes' study of leverrotational torque is also called torque or torque. Torque can change the rotational motion of an object. Pushing or pulling involves forces, while torsion involves moments. The moment is equal to the cross proct of the radial vector and the applied force
Extended data:
the properties of moment
1. The moment of force F to point O is not only determined by the force, but also related to the position of moment center. The moment varies with the position of the moment center
When the force is zero or the arm of force is zero, the moment is zero When the force moves along its action line, because the magnitude, direction and arm of the force do not change, the moment does not change The algebraic sum of the moments of two mutually balanced forces at the same point is equal to zerothe lifting torque is: lifting amplitude (never use the arm length, there is an angle relationship!) The proct of weight and lifting capacity
range: it refers to the rotation center of the lifting equipment (such as the rotation center of the crane, don't understand it as the fulcrum of the arm)!) The horizontal distance to the center of gravity of the object to be hoisted (Note: it is the center of gravity, not the center). The common unit is meter (feet are also commonly used in foreign countries)
lifting capacity: the weight of lifting objects (including rigging and spreader), commonly used unit: ton (also commonly used abroad: pound)
so we often use (ton meter) as the unit of lifting torque
see if this is helpful to you
this information is provided by Longhai lifting tool