Shulou(Shulou.com)11/24 Report--

CTOnews.com, September 17 (Xinhua)-- according to calculations by Dr. Drang's LeanCrew blog, the iPhone 15 Pro is lighter than the iPhone 14 Pro, not only because of the change from stainless steel to titanium, but also because the moment of inertia of the phone has changed.

CTOnews.com noted that the weight of iPhone 15 Pro is 187g, which is 9% less than the 206g of iPhone 14 Pro. At the press conference, Apple stressed that the lightness of the new phone was due to the replacement of stainless steel frame to titanium, and journalists who have experienced the iPhone 15 Pro have noticed that the phone is lighter in their hands.

The new analysis shows that the iPhone 15 Pro feels lighter, not only because it weighs less, but also because its moment of inertia has changed. Moment of inertia is a basic concept in physics, which measures the ability of an object to resist rotational motion, and its value is determined by the mass and mass distribution of the object. The farther the mass is from the axis of rotation of the object, the greater the moment of inertia. Therefore, for commonly used objects such as smartphones, the moment of inertia plays an important role in their heavy or light feel in daily use.

The change in the material of the iPhone 15 Pro frame from stainless steel to titanium plays a key role in this change, as a large part of the weight reduction of the new machine is concentrated in its outer frame. Dr. Drang believes that by mainly reducing the mass of the outer frame, Apple has achieved a more significant effect of reducing the moment of inertia of the phone than simply reducing the weight. This makes iPhone 15 Pro easier to rotate, making it lighter than 14 Pro.

Based on the analysis of the size of the new machine, and assuming that the mass reduction is mainly in the frame of the mobile phone, the moment of inertia of the iPhone 15 Pro is estimated to be reduced by 14-15%. Overall, this means that the iPhone 15 Pro is not only lighter, but also has a lower moment of inertia due to its mass distribution, which makes the phone feel lighter.

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