A standard friction coefficient for rubber on wood, the closest comparison I could find, is 0.70 for static friction (sometimes called stiction), or friction at a standstill. Assume the rubber-footed MacBook-it has four feet, just like a MacBook Air-is on a wood table. But it’s also lighter, which means it takes less force to move it.īut we have to factor in friction. The new MacBook has rubber feet on the bottom, just like the current Apple laptops.
(Aerospace engineer Bradley Grzesiak cautioned me to avoid too many decimal places: earth’s gravity varies enough around the globe.) We multiply that by 0.92 kg to get our force in newtons, or approximately 9N. The earth exerts a pull of roughly 10m/s 2 at the surface. Let’s assume the MacBook is on a level surface. But we also have gravity in our world, and a so-called normal force must be calculated. We start with its mass, 2.03 lbs (0.92 kg), which would require a force of about 0.9N to accelerate it to 1m/s 2. The MacBook exerts a pull of its own, just sitting there. Hold on! Some math’s coming, but it’s worth it. MagSafe (right) and MagSafe 2 (left) aren’t as versatile as USB-C, but they’ve saved our bacon so many times.īut how likely is a cord-tripper to yank a new MacBook off a surface versus the USB-C cable coming out first? My calculations, vetted by Mack and a variety of engineers, show it’s almost certain the MacBook will move a bit or a lot unless all your stars perfectly align.
As astrophysicist Katie Mack said, “The genius of the MagSafe connector is that if you apply a force in any other direction it breaks the magnetic seal very easily, and then there’s virtually no force required to remove the connector entirely.”
Second, while MagSafe was optimized to help with “non-axial” force-any direction except straight out-the USB-C style plug and jack suffer the worst from that. It has two distinct differences: first, a USB-C male end, such as the tip of a cable, is plugged into a port, very much like larger and deeper Type A and Type B USB connections. And yet that (very) shiny new MacBook aimed at the largest slice of the MacBook Air market doesn’t have it.A USB Type C (or USB-C) cable has no such advantage. It’s one of the features that even the most die-hard opponents of Macs tend to grudgingly admit is a good idea. The magnetic power cord attaches securely and detaches cleanly. MacBook Air offers innovations you won’t find anywhere else - like the MagSafe 2 power connector, which breaks cleanly away from the notebook if you accidentally trip over the power cord. It is still highlighted on Apple’s website as one of the key design features of both the MacBook Pro and MacBook Air. MagSafe has been one of the key features of MacBooks since it was first introduced by Apple in 2006. Reducing a machine to just one port was the first dropping MagSafe was the second. When Apple unveiled the new 12-inch MacBook with just a single port (plus a headphone socket), it was doing not just one radical thing, but two.
#MAGSAFE 2 MACBOOK USB C FULL#
What the heck, I’ll give it a try… expand full story For less than half the price of a discounted $77 Apple MagSafe Adapter this $37 charger includes 5 USB ports and gets solid 4.3/5 star reviews. As I was looking for options on Amazon, I came across an interesting product: The “BND 85W MagSafe 2 Replacement Power Adapter Charger w/ 5 USB Ports for Apple MacBook Pro”. So I thought I’d get a little creative and save a few bucks at the same time.
#MAGSAFE 2 MACBOOK USB C PRO#
But clearly Apple has some redesigned MacBook/Pro/Airs coming later this month and they will likely be charged via USB-C, at least in some cases. So that means I only need MagSafe to power this 2013 MacBook Pro for at least a few more weeks before it gets relegated to backup machine, kid’s computer or sold off when I get Apple’s new OLED/USB-C creation. So what to do? Typically I’d buy a new Apple Magsafe 2 adapter.
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