Google News
logo
Mechanical Engineer - Interview Questions
What is the difference between torque and moment of force?
Torque and moment of force are related concepts in mechanics, but they refer to slightly different aspects of rotational motion and are measured in different units. Here are the key differences between torque and moment of force:

Torque :

* Definition : Torque, also known as a moment or moment of force, is a measure of the tendency of a force to rotate an object around a specific axis or pivot point. It is a rotational analog of force and is denoted by the symbol "τ" (tau).

* Units : Torque is measured in units of force multiplied by distance, typically Newton-meters (Nm) in the International System of Units (SI) or foot-pounds (ft-lb) in the Imperial system.

* Direction : Torque is a vector quantity with both magnitude and direction. The direction of torque is perpendicular to the plane formed by the force and the lever arm (the distance between the axis of rotation and the point where the force is applied).

* Calculation : The torque (τ) is calculated as the product of the force (F) and the lever arm (r) according to the formula: τ = F × r × sin(θ), where θ is the angle between the force vector and the lever arm vector.

* Application : Torque is commonly used in mechanical systems, such as engines, gears, and wrenches, to describe the rotational effect of forces. It plays a crucial role in understanding and designing systems involving rotational motion.

Moment of Force :

* Definition : The moment of force, often simply called "moment," is a more general term that refers to the turning effect produced by a force about any arbitrary axis. It includes both torque (rotational moment) and any linear forces or moments acting along or parallel to the axis of rotation.

* Units : The moment of force is also measured in units of force multiplied by distance, such as Nm or ft-lb.

* Direction : Like torque, the moment of force is a vector quantity with magnitude and direction. It accounts for all the forces and moments acting on an object and their respective moments about a specified axis.

* Calculation : The calculation of the moment of force considers all forces and moments acting on an object, and it can be more complex than calculating torque alone, especially in situations involving multiple forces and axes of rotation.

* Application : The moment of force is a broader concept and is used in engineering and physics to analyze and describe the equilibrium and motion of objects subject to various forces and moments.
Advertisement