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Physics

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Physics

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Motion in Two or Three Dimensions

How Velocity Changes Create Acceleration

Description

Acceleration describes how velocity changes over time. In physics, acceleration is a vector, which means it has both size and direction. It points in the same direction as the change in velocity, written as Δv. The larger the acceleration, the larger the change in velocity over a given time.

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Transcript

速度是一个矢量,是带有方向的速度。当速度发生变化时(通过加速或减速)或方向改变或两者同时变化时,存在加速度。

表示加速度的数学方法是速度随时间的变化。

假设对象以恒定速度移动。转弯时,它会减速。它的瞬时速度在大小和方向上都会发生变化。设位于 P1P2 处的瞬时速度矢量为矢量 v1v2

通过减去向量,可以得到速度的变化,即 delta 向量 v

现在,平均加速度矢量的方向将是速度变化的方向。平均加速度矢量由 Δ 矢量 v 和...

Tags

Acceleration VectorVelocity ChangeInstantaneous AccelerationAverage AccelerationDirection ChangeSpeed ChangeVector DerivativeMotion AnalysisPhysics KinematicsVector Quantities

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