AP物理C力学词汇

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　　AP物理C力学词汇

　　instantaneous acceleration

　　瞬间加速度

　　Acceleration measured at a particular instant in time.

　　instantaneous velocity 瞬时速度

　　Vector form of speed measured at a particular instant in time.

　　scalar 标量

　　A quantity that can completely be specified by a magnitude.

　　vector 矢量

　　A quantity that is completely specified by a magnitude and a direction; the direction of a vector can be given in several formats, including positive and negative values; trigonometric functions; north, south, forward, up, and down coordinates; or any term useful for the physical situation.

　　acceleration 加速度

　　Describes the change in velocity within a time interval in units of meters per second per second (m/s).

　　displacement 位移

　　A vector quantity that determines the change in position of an object by measuring the straight-line distance and direction from the starting point to the ending point.

　　distance 路程

　　A scalar quantity that measures the total length of the path taken by a moving object.

　　speed 速度

　　A scalar quantity measuring the time rate of change of distance.

　　velocity 速度

　　A vector quantity representing the time rate of change of displacement.

　　free fall 自由落体

　　Any motion of a body where gravity is the only force acting upon it.

　　kinematics

　　运动学 In mechanics, the study of how objects move.

　　equilibrium force 平衡力

　　The force equal in magnitude and opposite in direction to the resultant of two or more forces that brings a system into equilibrium.

　　friction 摩擦力

　　The opposing force between two surfaces that are sliding or rolling parallel to one another that opposes the applied force on an object.

　　inertia 惯性 The tendency of an object to resist a change in motion.

　　Newton's First Law 牛顿第一定律

　　Newton’s First Law says that an object will continue in its state of motion unless compelled to change by a net force impressed upon it.

　　normal force 弹力

　　The force that is exerted by any object in contact with another object.

　　static friction 静摩擦

　　Friction that occurs when there is no relative motion between two surfaces (e.g., a book sitting on an incline).

　　weight 重力

　　The force of gravity on an object.

　　Newton's Second Law

　　牛顿第二定律

　　The magnitude of the acceleration of an object is directly proportional to the resultant force acting on it and inversely proportional to its mass; the direction of the resultant acceleration is in the direction of the resultant force.

　　action-reaction pairs 作用力与反作用力

　　Sets in which forces are always found, reflecting the fact that for every action there is a simultaneous equal and opposite reaction.

　　Newton's Third Law 牛顿第三定律

　　If two objects interact, the magnitude of the force exerted on object A by object B is equal to the magnitude of the force simultaneously exerted on object B by object A;these forces are opposite in direction.

　　angular acceleration 角加速度 Rate at which changes in angular velocity occur.

　　angular velocity 角速度

　　Measure of changes in angular displacement as they occur over time.

　　average acceleration 平均加速度

　　Acceleration measured over a substantive time interval.

　　average velocity 平均速度

　　The vector form of speed and the displacement per time interval; a measurement taken over the entire interval.

　　centripetal acceleration 向心加速度

　　Acceleration toward the center of a circular path.

　　centripetal force 向心力

　　The force that maintains circular motion; equal to mass × centripetal acceleration.

　　uniform circular motion

　　匀速圆周运动

　　Motion around a circle at a constant speed.

　　universal gravitational constant 万有引力常数

　　G, a number that had to be measured experimentally; its value is G = 6.67 × 10 N ⋅ m2 /kg2.

　　work 功

　　The force applied multiplied by the displacement over which the force is applied.

　　conservative force 保守力

　　A force that creates no net loss of energy when used to do work (e.g., gravity).

　　Hooke’s law 胡克定律

　　Strain is proportional to stress on a spring below the elastic limit of the spring.

　　kinetic energy 动能

　　The energy possessed by a mass because of its motion relative to a frame of reference.

　　work energy theorem 动能定理

　　Theorem stating that the net work, W , done on an object equals the change in kinetic energy, ΔK, of the object: W = ΔK = K – K.

　　force 力

　　Push or pull exerted on an object that causes acceleration.

　　power 功率

　　Measure of the rate at which work is done; work (or change in energy) divided by time interval.

　　watt (W) 瓦特

　　The SI unit of power, equal to 1 J/s.

　　center of mass 质量中心

　　Point at which an object’s weight is concentrated or centered; point used to describe the object’s responses to external forces.

　　impulse 冲量

　　Force multiplied by the time over which the force is applied.

　　momentum 动量

　　Mass × velocity

　　elastic collision 弹性碰撞

　　A collision between two objects in which there is a rebounding and no loss of kinetic energy occurs.

　　inelastic 非弹性

　　A collision in which two masses interact and stick together, leading to an apparent loss of kinetic energy.

　　phase 相位

　　Phase (waves), the position of a point in time (an instant) on a waveform cycle.

　　restoring force 回复力

　　Restoring force, in a physics context, is a force that gives rise to an equilibrium in a physical system.

　　simple harmonic motion

　　简谐运动

　　The oscillating motion that occurs when the force restoring the system to its equilibrium position is directly proportional to its displacement from the equilibrium position.

　　spring constant 劲度系数

　　In SI units, displacements are measured in meters (m), and forces in Newtons (N or kg·m/s2). Therefore, the spring constant k, and each element of the tensor κ, is measured in Newtons per meter (N/m), or kilograms per second squared (kg/s2).

　　strain 应变

　　Strain, a geometrical measure of deformation representing the relative displacement between particles in a material body.

　　stress 应力

　　The internal forces that neighboring particles of a continuous material exert on each other.

　　vibration 摆动

　　Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point.

　　amplitude 振幅

　　Measurable feature of a wave corresponding to the maximum value that the medium is disturbed from equilibrium (i.e., its condition when there is no wave present).

　　elastic potential energy 势能

　　Elastic energy is the potential mechanical energy stored in the configuration of a material or physical system as work is performed to distort its volume or shape.

　　frequency 频率

　　The number of completed periodic cycles per second in an oscillation or wave motion.

　　oscillatory motion 振荡

　　Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.

　　period 周期

　　The time it takes an object or system to complete one cycle (e.g., a spring or any other simple harmonic oscillator).

　　lever arm 力臂 The distance between the point of application of a force and the axis.

　　torque 力矩

　　The rotational analogue to force; product of force and the perpendicular distance between the axis of rotation and the extended line of the force vector.

　　equilibrium 平衡

　　The balancing of all external forces acting on a mass; the result of a zero vector sum of all forces acting on an object.

　　angular displacement 角位移

　　Angular displacement of a body is the angle in radians (degrees, revolutions) through which a point revolves around a center or line has been rotated in a specified sense about a specified axis.

　　angular momentum 角动量

　　In physics, angular momentum (rarely, moment of momentum or rotational momentum) is the rotational equivalent of linear momentum.

　　kinematics 动力学

　　Analysis of motion without paying attention to the forces causing the motions.

　　law of conservation of angular momentum 角动量守恒定律

　　In the absence of external torques, the total angular momentum of a system remains constant.

　　moment of inertia 转动惯量

　　The angular mass or rotational inertia, of a rigid body is a tensor that determines the torque needed for a desired angular acceleration about a rotational axis; similar to how mass determines the force needed for a desired acceleration.

　　rotational inertia 转动惯性

　　The property of matter that resists the action of applied force trying to change the motion of an object.

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