SAT词汇的掌握是大家取得SAT考试好成绩的基础，今天小编为大家提供了有关物理学的词汇，以下是详细内容。

　　Faraday’s Law

　　A law, | | = , which states that the induced emf is the change in magnetic flux in a certain time.

　　First Law of Thermodynamics

　　Essentially a restatement of energy conservation, it states that the change in the internal energy of a system is equal to the heat added plus the work done on the system.

　　Focal length

　　The distance between the focal point and the vertex of a mirror or lens. For concave mirrors and convex lenses, this number is positive. For convex mirrors and concave lenses, this number is negative.

　　Focal point

　　The point of a mirror or lens where all light that runs parallel to the principal axis will be focused. Concave mirrors and convex lenses are designed to focus light into the focal point. Convex mirrors and concave lenses focus light away from the focal point.

　　Force

　　A push or a pull that causes an object to accelerate.

　　Free-body diagram

　　Illustrates the forces acting on an object, drawn as vectors originating from the center of the object.

　　Frequency

　　The number of cycles executed by a system in one second. Frequency is the inverse of period, f = 1/T. Frequency is measured in hertz, Hz.

　　Frictional force

　　A force caused by the roughness of two materials in contact, deformations in the materials, and a molecular attraction between the materials. Frictional forces are always parallel to the plane of contact between two surfaces and opposite the direction that the object is being pushed or pulled.

　　Fundamental

　　The standing wave with the lowest frequency that is supported by a string with both ends tied down is called the fundamental, or resonance, of the string. The wavelength of the fundamental is twice the length of the string.

　　Efficiency

　　For a heat engine, the ratio of work done by the engine to heat intake. Efficiency is never 100%.

　　Elastic collision

　　A collision in which both kinetic energy and momentum are conserved.

　　Electric generator

　　A device that converts mechanical energy to electrical energy by rotating a coil in a magnetic field; sometimes called a “dynamo.”

　　Electromagnetic induction

　　The property by which a charge moving in a magnetic field creates an electric field.

　　Electromagnetic spectrum

　　The spectrum containing all the different kinds of electromagnetic waves, ranging in wavelength and frequency.

　　Electromagnetic wave

　　A transverse traveling wave created by the oscillations of an electric field and a magnetic field. Electromagnetic waves travel at the speed of light, m/s. Examples include microwaves, X rays, and visible light.

　　Electron

　　A negatively charged particle that orbits the nucleus of the atom.

　　Electronvolt

　　A unit of measurement for energy on atomic levels. 1 eV = J.

　　Energy

　　A conserved scalar quantity associated with the state or condition of an object or system of objects. We can roughly define energy as the capacity for an object or system to do work. There are many different types of energy, such as kinetic energy, potential energy, thermal energy, chemical energy, mechanical energy, and electrical energy.

　　Entropy

　　The disorder of a system.

　　Equilibrium

　　The state of a nonrotating object upon whom the net torque acting is zero.

　　Equilibrium position

　　The stable position of a system where the net force acting on the object is zero.