You can’t in a car, but you just can in a bike.
The problem with that, though, is that the lighter parts are lighter so, if there is any force on them, it tends to pull the magnet down and then light the bulb in your hand. At some point the force on the magnet gets too great and you lose the contact and the light will not get off on its own. The same problem applies to a bicycle: any force on the rear wheel and you’re going to make the derailleur move out of alignment too late. A good bike mechanic is going to have a plan in place to deal with that, and that’s what it looks for.
A small part of the reason for this is that a bike is almost a complete package: it’s got a frame, fork, spokes, wheels, pedals, brakes, gas tank, fuel tank, front suspension, rear suspension, brake pads, and a bike stand which are usually more than the sum of their parts.
Also, bikes are inherently unstable. When the bike takes a fall, there’s a lot of resistance involved and all the things the rider is wearing are going to affect the outcome. In any way, shape or form, a bike can roll over. You cannot have stable handling in a bicycle: all you can do is balance. A bike can just stop if it hits something.
A lighted bike with a derailleur/differential will stop and be able to stay on the road with a tiny bit of wobble.
To get stable handling you’ll need to do everything right. If the bike has a derailleur you’ll need to have the cable adjusted and/or make sure the derailleur can go at least a few gears. If the fork has a different rear end and is not adjustable (like a mountain bike or something) and there’s not enough weight or power on the rear wheel, you’ll want to have the front suspension set back. If an arm is bent too far, or the frame and fork are not properly aligned, your bike will not have enough power to keep up with the force that’s pushing the bike in the same direction it’s heading, and so you lose control. If, for some reason, a bike needs a lot of power from its rear wheel, it’ll be very difficult to get the front wheel to be in line with the rear wheel. A bicycle may also roll over with its rear wheel in front of its center, and that
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