“impulse”的概念、定义、翻译、参考文献-科学参考

impulse

Physics

Symbol J. The product of a force F and the time t for which it acts. If the force is variable, the impulse is the integral of Fdt from t₀ to t₁. The impulse of a force acting for a given time interval is equal to the change in momentum produced over that interval, i.e. J=m(v₁ − v₀), assuming that the mass (m) remains constant while the velocity changes from v₀ to v₁.

Mathematics

The impulse J associated with a force F acting during the time interval from t = t₁ to t = t₂ is the definite integral of the force, with respect to time, over the interval. Thus J is the vector quantity given by

$J = \int_{t_{1}}^{t_{2}} F d t .$

Suppose that F is the total force acting on a particle of mass m. From Newton’s second law of motion in the form F = (d/dt)(mv), it follows that the impulse J is equal to the change in the linear momentum of the particle.

If the force F is constant, then J = F(t₂−t₁). This can be stated as ‘impulse = force×time’.

The concept of impulse is relevant in problems involving collisions.

Impulse has the dimensions MLT⁻¹, and the SI unit of measurement is the kilogram metre per second, abbreviated to kgms⁻¹.

Chemical Engineering

1. A quantity used to measure the total change in momentum of a body produced by a force acting on the body for a very short time.

2. In process control, it is a disturbance to a process that occurs over a very short period of time.

Biology

The signal that travels along the length of a nerve fibre and is the means by which information is transmitted through the nervous system. It is marked by the flow of ions across the membrane of the axon caused by changes in the permeability of the membrane, producing a reduction in potential difference that can be detected as the action potential. The strength of the impulse produced in any nerve fibre is constant (see all-or-none response).
http://nerve.bsd.uchicago.edu/ Details of nerve impulses and other aspects of neurophysiology

单词	impulse
释义	impulse Physics Symbol J. The product of a force F and the time t for which it acts. If the force is variable, the impulse is the integral of Fdt from t₀ to t₁. The impulse of a force acting for a given time interval is equal to the change in momentum produced over that interval, i.e. J=m(v₁ − v₀), assuming that the mass (m) remains constant while the velocity changes from v₀ to v₁. Mathematics The impulse J associated with a force F acting during the time interval from t = t₁ to t = t₂ is the definite integral of the force, with respect to time, over the interval. Thus J is the vector quantity given by $J = \int_{t_{1}}^{t_{2}} F d t .$ Suppose that F is the total force acting on a particle of mass m. From Newton’s second law of motion in the form F = (d/dt)(mv), it follows that the impulse J is equal to the change in the linear momentum of the particle. If the force F is constant, then J = F(t₂−t₁). This can be stated as ‘impulse = force×time’. The concept of impulse is relevant in problems involving collisions. Impulse has the dimensions MLT⁻¹, and the SI unit of measurement is the kilogram metre per second, abbreviated to kgms⁻¹. Chemical Engineering 1. A quantity used to measure the total change in momentum of a body produced by a force acting on the body for a very short time. 2. In process control, it is a disturbance to a process that occurs over a very short period of time. Biology The signal that travels along the length of a nerve fibre and is the means by which information is transmitted through the nervous system. It is marked by the flow of ions across the membrane of the axon caused by changes in the permeability of the membrane, producing a reduction in potential difference that can be detected as the action potential. The strength of the impulse produced in any nerve fibre is constant (see all-or-none response). http://nerve.bsd.uchicago.edu/ Details of nerve impulses and other aspects of neurophysiology
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