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Welcome to our Physics lesson on Moment of Force as Analogue of Force in Translational World, this is the first lesson of our suite of physics lessons covering the topic of Dynamics of Rotational Motion, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.
In our Physics tutorial "Moment of Force. Conditions of Equilibrium", we explained that moment of force (otherwise known as "turning effect of force") occurs when an object or system tends to rotate around a fixed point, which we called "pivot" or "turning point". Also, we explained that in a system, there are two possible conditions of equilibrium: one for the translational (linear) motion (resultant force must be zero) and the other for rotational motion (the resultant moment of force must be zero). From here, it is easy to conclude that the analogue quantity of force in rotational motion must be the moment of force, M⃗, which - like force in translational motion - is a quantity that determines the equilibrium of the system.
Moment of force is obtained by the cross product of distance from turning point, r⃗ and the perpendicular force to the axis of rotation, F⃗.
Mathematically, we have
We have also stated that the unit of moment of force is Newton × metre, [N × m].
If the system is moving, we use the concept of torque τ instead of that of moment of force M, i.e.
You have reached the end of Physics lesson 7.2.1 Moment of Force as Analogue of Force in Translational World. There are 8 lessons in this physics tutorial covering Dynamics of Rotational Motion, you can access all the lessons from this tutorial below.
|Tutorial ID||Physics Tutorial Title||Tutorial||Video|
|7.2||Dynamics of Rotational Motion|
|Lesson ID||Physics Lesson Title||Lesson||Video|
|7.2.1||Moment of Force as Analogue of Force in Translational World|
|7.2.2||Moment of Inertia|
|7.2.3||Moment of Inertia in Different Systems of Rotational Motion|
|7.2.4||Newton's Second Law for Rotational Motion|
|7.2.6||Work in Rotational Motion|
|7.2.7||Kinetic Energy in Rotational Motion|
|7.2.8||Power in Rotational Motion|
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