单词	moment of a force
释义	moment of a force A measure of the turning effect produced by a force about an axis. The magnitude of the moment is the product of the force and the perpendicular distance from the axis to the line of action of the force. An object will be in rotational equilibrium if the algebraic sum of all the moments of the forces on it about any axis is zero. See illustration. Moment of a force. For equilibrium mgb + F2 (b + c) = F1a, where mg is the weight of the beam acting through its centre of mass
随便看	heat capacity heat death of the universe heat engine heat exchanger heat of atomization heat of combustion heat of formation heat of neutralization heat of reaction heat of solution heat pump heat radiation heat shield heat transfer Heaviside-Kennelly layer Heaviside-Lorentz units heavy hydrogen heavy water heavy-fermion system hecto- Heisenberg uncertainty principle Heisenberg, Werner Karl heliocentric universe Helmholtz free energy Helmholtz, Hermann Ludwig Ferdinand von

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