The key to understanding this phenomenon lies not in magnetism nor in any sort of mystical ability but instead in the physics of friction.

理解这种现象的主要方面既不是在磁性也不是在神秘力量而是摩檫力的物理性质。

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Last year, four Japanese researchers won the physics prize for their work measuring the friction that occurs when someone steps on a banana peel.

去年，四名日本研究人员测量了人踩到香蕉皮后的摩擦力，获得了物理学奖。

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It is one of the difficult points of physics teaching to ask the static friction force of solving.

为解决静摩擦力难以判断的问题，提出了概念判断法、加速度判断法、综合分析法等方法。

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Then there's the Slide (pictured above) which relies on interesting physics to support the iPad: a heavy high-friction rubber cylinder is pulled out of its tubular compartment under the metallic slope, and it can be placed anywhere on the slope to support the iPad at any desired angle, up to somewhere around 70 degrees -- you can see it and the others in action in the earlier video.

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