Looking for a simple, quick demonstration of forces and acceleration in circle motion?

看过一简单、快速的演示圆周运动中力和加速度的变化吗？

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Uniform circular motion occurs when an object goes around in a circle and when the speed never changes.

匀速圆周运动发生在，当物体沿着一个圆环滚动，速率恒定的情况下。

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If you look at the motion of the planets in the sky, you will find that they don't simply go around the earth in a continuous circle.

抬头仰望天空中行星的运动，你将会发现它们并不是简单地绕着地球旋转。

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At any instant, your motion, if it follows any curve, locally can be approximated as being part of some circle.

在任何时候,如果做曲线运动,都可以近似地认为是圆周的一部分

耶鲁公开课 - 基础物理课程节选

We're describing the motion of a particle in a circle.

我们描述了圆周上一个点的运动

耶鲁公开课 - 基础物理课程节选

The time-sensitive pattern created by that pinch-circle motion, along with the motion involved in rotating the dial, are complex enough that Memon says a study of about 100 users has shown it can identify users with about 2% false positives and 2% false negatives.

FORBES: Gesture-Based Login Apps For iPad And iPhone Aim To Banish Passwords From Touchscreens

New input interfaces including the Circle Pad, motion sensor, gyro sensor.

FORBES: Nintendo 3DS System Information

But instead of merely turning the lock to certain numbers, the user first forms the lock with a pinching motion that creates a circle outline.

FORBES: Gesture-Based Login Apps For iPad And iPhone Aim To Banish Passwords From Touchscreens