Algodoo

Thanks.

Nice improvements. Your next job, if you choose to accept it, is to make it so the car can knock over the light poles.

Nice work.
For those who are interested:
The Chain Fountain AKA The Mould Effect

Dispute on “MOULD EFFECT” (Chain Fountain)

World Record Chain Fountain? The Mould Effect Explained

No, it just seemed to work better with lower gravity. I might have been able to get the same effect with a denser chain.

Thanks Xray.

You could delete "e.this." and replace ":=" with "=" in your code.

Code in "e.this._time >= 5" never executes.

The following arm code will also work:
(e)=>{
_time = _time + _interval;
_time >= 5 ? {
_time = 0
} : {};
_time >= 1 ? {
ra := [[-1.5, 2.75], [-1.25, 3.5], [-1.0, 3.75], [-0.5, 3.75]];
vel = (ra(math.toInt(_time - 1.0)) - pos) * _animspeed}:{};
}

Recommendations:
1. Set flamingo friction equal to bench friction.
2. Show the tangent of the inclination angle since the coefficient of friction needs to be less than the tangent of the inclination angle in order for the object to continue sliding.

Looking good.

Works well.

I had done experiments with varying the motor speed based on the weight of beads in the beaker but in the end I decided to keep the scene simple and run at constant speed.

Motorboat guy is living dangerously.

No.

With this scene I get 12m height with no gravity and 3m height with full gravity. Also I get 3m height if the chain balls are 2kg/m^2 or 20kg/m^2.

Good work.

Click on Right Half of circle that contains the ball for Clockwise Rotation ...

This scene shows how to extend the capabilities of Algodoo. Try to make a simple spring mass system in Algodoo with a 1 mm steel block with a mass of 0.00000785 kg and a 1.5 mm spring with k = 0.025 N/m.

FYI. I was able to make a simple spring mass system in Algodoo with a 1 mm steel block with a mass of 0.00000785 kg and a 1.5 mm spring with k = 0.025 N/m. It was not too user friendly because it's hard to select small stuff, but the simulation ran OK and gave the expected results.

Nice work.

Thanks.

Thanks.

I would typically make scenes using 1" = 1 Algodoo meter without any scaling and the inertia effects and gravity forces would be all wrong. I decided to tackle metric scaling first, since most of the world is metric. I can now use Imperial units and the scene will respond realistically. One interesting thing that I found while making these scenes is that the natural frequency of a spring mass system in earth's gravity is dependent only on the spring deflection when the mass is at rest.

Yes, Algodoo springs are linear. The natural frequency (in radians/sec) of a spring mass system is w=(k/m)^0.5. k=F/x and m=F/g which means w=(g/x)^0.5. That equation is similar to the pendulum equation which is w=(g/L)^0.5.

Q: There seems to be some bug in code , some time Answer is not shown properly. Pl help if you can.
A: If you want help with bug, then provide a better description of the bug. "Answer is not shown properly" is too vague.

Q: Can we get questions answer data from Excel Sheet or external text file ?
A: Yes, if Excel sheet is saved as .csv file. Use System.ReadWholeFile function.

15X9=135, but 135 is not on the list.

The table shows conversion factors for converting real life properties to Algodoo simulation values. The scene multiplies m and k by the conversion factors and applies them to the spring and box and then sets gravity equal to g. The simulation response is correct with respect to time.

Xray: This seems like an overly-complex solution for a simple problem!
Steve: I agree, but you don't state the problem nor a simpler solution. The problem, as Andrew Klein sees it, is that the table needs open access in the middle of the table. If the table did not have a slot in the center that needed open access down to the floor, then the simple solution would be to weld the nuts to a common bar and have that bar pivot at the center of the table. The problem with the instant center approach is that it's an approximation and has limited rotary range. The problem with both approaches is that the linkages act as separate swivels as opposed to a common bar with a pivot in the middle. As a result, the nuts squeeze the screw ends towards each other with a theoretical infinite force when there is tension in the screws. Algodoo shows 1134 pounds squeezing force for the instant center and 15 pound squeezing force for the remote center when a 10 pound clamping force is applied. Both values are excessive. That is why the inventor states that the mechanisms need to be clamped to the table before full clamping force is applied.

Note: It's easy for me to act like an expert and criticize someone else's design. The fact is that the inventor made a design that works well and he is selling it. That's quite an accomplishment. It's a long hard road between having an idea and creating a marketable product.

Nice work as usual. My only recommendation would be to remove the pie slices in the wheels.

Guess I'm a genius or just plain lucky. It's hard to be humble when you're perfect in every way.

I concur. If there was a quick release nut for each screw then you wouldn't need the geared transmission. The pipe clamp twin screw vises seem to be the simplest implementation. Clever Quick Release Pipe Clamp Vise for my Workbench looked interesting.

Q: Would it be important to show the two magnets in the scene?
A: I purposely didn't show them so people can wonder how it's done in real life and in Algodoo. Apparently, judging from the view to download ratio, 90% of the users either figured it out or just don't care enough to dig deeper. I initially tried to make the nuts magnetic using Algodoo attraction but failed. I will add a note to the scene just to make it easier on the users so they don't stay awake late at night trying to figure out how it's done.

Thanks.

I paused the simulation when changing attachments. I was thinking that in real life they could be snap-in but didn't design it into the Algodoo scene. I was also thinking that the green, pink, and V attachments would be the only items a person would need to snap in and out. I don't see any advantage to taking apart the yellow and blue components. I just tried snapping the parts in and out. Snap-in works for some. Snap-out doesn't seem to work at all. I will update the description.

Thanks for the feedback. Sorry about the misleading description.