SAT2物理考试是同学们参加SAT2考试时经常选择的科目之一。今天为大家整理的是SAT2物理常用术语，非常详细和全面。同学们一定要加强SAT2物理的复习，争取夺得物理满分。

　　The following list defines all of the bold-faced words you encountered as you read this book.

　　W

　　Wave

　　A system with many parts in periodic, or repetitive, motion. The oscillations in one part cause vibrations in nearby parts.

　　Wave speed

　　The speed at which a wave crest or trough propagates. Note that this is not the speed at which the actual medium (like the stretched string or the air particles) moves.

　　Wavelength

　　The distance between successive wave crests, or troughs. Wavelength is measured in meters and is related to frequency and wave speed by = v/f.

　　Weak nuclear force

　　The force involved in beta decay that changes a proton to a neutron and releases an electron and a neutrino.

　　Weber

　　The unit of magnetic flux, equal to one T · m2.

　　Weight

　　The gravitational force exerted on a given mass.

　　Weightlessness

　　The experience of being in free fall. If you are in a satellite, elevator, or other free-falling object, then you have a weight of zero Newtons relative to that object.

　　Work

　　Done when energy is transferred by a force. The work done by a force F in displacing an object by s is W = F · s.

　　Work function

　　The amount of energy that metal must absorb before it can release a photoelectron from the metal.

　　Work-energy theorem

　　States that the net work done on an object is equal to the object’s change in kinetic energy.

　　Z

　　Zeroth Law of Thermodynamics

　　If two systems, A and B, are in thermal equilibrium and if B and C are also in thermal equilibrium, then systems A and C are necessarily in thermal equilibrium.

　　The following list defines all of the bold-faced words you encountered as you read this book.

　　Torque

　　The effect of force on rotational motion.

　　Total internal reflection

　　The phenomenon by which light traveling from a high n to a low n material will reflect from the optical interface if the incident angle is greater than the critical angle.

　　Transformer

　　A device made of two coils, which converts current of one voltage into current of another voltage. In a step-up transformer, the primary coil has fewer turns than the secondary, thus increasing the voltage. In a step-down transformer, the secondary coil has fewer turns than the primary, thus decreasing the voltage.

　　Translational kinetic energy

　　The energy of a particle moving in space. It is defined in s of a particle’s mass, m, and velocity, v, as (1/2)mv2.

　　Translational motion

　　The movement of a rigid body’s center of mass in space.

　　Transverse waves

　　Waves in which the medium moves in the direction perpendicular to the propagation of the wave. Waves on a stretched string, water waves, and electromagnetic waves are all examples of transverse waves.

　　Traveling waves

　　A wave with wave crests that propagate down the length of the medium, in contrast to stationary standing waves. The velocity at which a crest propagates is called the wave speed.

　　Trough

　　The points of maximum negative displacement along a wave. They are the opposite of wave crests.