If you do not mind the sensation of magnetic resistance, then a quieter ride is more beneficial. These pads, therefore, create the light “whooshing” sound when they come in contact with the flywheel.Ī magnetic system bike is almost silent due to the spinning flywheel traveling through the magnetic field and not contacting anything. A friction system works using cotton pads applying pressure to the spinning flywheel, as we discussed previously. If you have ridden an indoor cycling bike yourself and heard a soft “whooshing” sound being produced, then you are in the presence of a bike that uses a friction resistance system. The resistance change is smooth, consistent, and hard to beat. Just as you instantly feel the incline change as you begin to ride up a hill, the resistance change immediately starts as you turn the knob. For cyclists who have become accustomed to a friction system’s feel, it can take a little time to acclimate to this type of system.įriction resistance resembles riding a road bike. A magnetic resistance system has a slight light lag from when the resistance knob is turned until you feel the resistance begin. The feel of these two systems can be a significant deciding factor on which option you might prefer. We will discuss the differences that make each design unique. The closer the magnets get to the flywheel, the greater the magnetic field, therefore higher resistance is felt on the bike.ĭetailed Differences of Magnetic & Friction ResistanceĪlthough, in the end, both resistance systems successfully add resistance to the indoor cycling bike, they are vastly different. When the resistance knob turns to either increase or decrease resistance, the magnets move closer or farther away from the flywheel. The energy current flows in a closed-loop circuit that runs perpendicular to the magnetic field. An eddy current gets its name from the swirling motion of an eddy in a stream. This magnetic field causes a drag on the metal flywheel, which creates an eddy current. The metal flywheel, which works as a conductor in this instance, spins through the two magnets’ magnetic fields and the force surrounding them. A standard design contains two powerful magnets located parallel to one another with the flywheel between them. For magnetic resistance to occur, a few things need to happen, and as you can guess, this process includes magnets. The north end on a compass therefore currently points roughly towards Alaska and not exactly towards geographic north.What is the Magnetic Resistance on an Exercise BikeĪs more bike designs are including magnetic resistance, it is crucial to understand what magnetic resistance is and how it works. Currently, the magnetic south pole lies about ten degrees distant from the geographic north pole, and sits in the Arctic Ocean north of Alaska. Furthermore, earth's magnetic poles are constantly changing location relative to earth's geographic poles. Earth's magnetic field is caused by circulating currents of liquid iron in the outer core. Earth's geographic and magnetic poles are not exactly aligned because they arise from different mechanisms. Earth's magnetic poles designate the central location of the region where the magnetic fields lines start and finish. A person standing on the equator is moving the fastest due to earth's rotation, while a person standing on a geographic pole does not move at all from earth's rotation. The points where your thumb and finger make contact are the geographic north and south poles of the tennis ball's spin. Consider holding a tennis ball between your thumb and forefinger and pushing on the side to make it spin. The geographic north and south poles indicate the points where the earth's rotation axis intercepts earth's surface. Therefore, the magnetic field lines of the earth run from the southern geographic hemisphere towards the northern geographic hemisphere. Magnetic field lines outside of a permanent magnet always run from the north magnetic pole to the south magnetic pole. This fact means that the north end of a magnet in a compass is attracted to the south magnetic pole, which lies close to the geographic north pole. When it comes to magnets, opposites attract. Furthermore, the magnetic pole near earth's geographic north pole is actually the south magnetic pole.
A magnetic compass points to the earth's magnetic poles, which are not the same as earth's geographic poles. Baird.Ī magnetic compass does not point to the geographic north pole. Public Domain Image, source: Christopher S.
The earth spins around the geographic poles, but magnetic compasses point to the magnetic poles. The magnetic poles (red line) and geographic poles (in green) are separated by about ten degrees right now.
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