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4 Revolutionary Riddles
newtboy3) it moves backwards because the force is applied to the entire system/bicycle. The wheel going backwards turns the gears and chain, rotating the pedal 'forwards' (rotating it in reverse). Because the wheel is much larger it travels much farther back than the pedal rotates forwards, even with 1:1 gearing the pedal actually travels backwards slightly compared to the ground, but in higher gears it gets much easier.
It's because the tire is so much larger than the crank, that makes it easier to rotate the tire than the crank even at 1:1, so it goes backwards.
It's counter intuitive, but I actually checked my work and yep, my bike went backwards in all gears....no sliding needed. Try it.
I guess the hint for these is the rotational test that they show at the first.
1) A sticky object that would let go like a wall crawler that climbs down a wall would create this effect. (see below)
2) You can't. As you approach infinite speed it would get very close. (see below)
3) The bike will move forward. (see below)
4) The outside parts of the wheels that overlap the rail. Also if the train has a flywheel that is larger than the wheel size the bottom of the flywheel would also always move backwards faster than the train was moving.
1) He says "what object is inside?" so I'm not sure a liquid would count. Also a viscous liquid would flow a slow rate and would probably not stop and start. You might be able to get a viscous liquid to stop and start if you had fins, but that still might just move slowly or gain enough momentum to roll fast without any flow.
2) A little excel calculation shows that the average velocity approaches twice the initial but will never hit it.
attempted m/s - total time - average m/s
1 100 1
2 50 1.333333333
3 33.33333333 1.5
...
200 0.5 1.990049751
201 0.497512438 1.99009901
3) I'm not sure if the parameters of this experiment are explained sufficiently.
If it is allowed to slip then no matter the mechanical advantage a hard pull should always be able to get the bike to skid back and defeat friction.
If the bike is not allowed to slip on the ground then I don't understand how it could ever move backwards, the only options would be that it doesn't move at all or it moves forward.
If it can't slip then the ratio of the pedal to the wheel is what is in question. Bikes only have gear ratios higher than 1 and the crank is smaller than the tire so the tire will always rotate more than the crank thus the bike should move forward.
Soccer played with 3rd leg ... Is there a rule for that...
mkknyr says...Well, it seems like in the first shot of the goal, he is running toward the goal when he meets the ball in a sliding motion, ending up on the ground. In the reverse angle replay, he is simply standing still, there is no sliding motion, just a groin to ball thrust. Then, the ending is just too ridiculous. Definitely staged.
Upvote for the brave actor taking countless soccer balls to the twins for the sake of comedy.
How do you measure a man? Kronosposeidon (Books Talk Post)
blankfistNo sliding for me, I'm on a schedule, dammit! It's get in, get fucked and get the hell out. I've already got my knob in my hand. Who wants communion?