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    What to study in prep for writing a physics engine?

    I remember taking acceleration into account to calculate velocity, but using an average is a new idea. Thanks :)
  2. I

    What to study in prep for writing a physics engine?

    Alright, thanks for the information.
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    What to study in prep for writing a physics engine?

    I compared the two when developing one of the engines, but I didn't notice enough of a difference for it to be worth the extra overhead and complexity. I'm sure this will change when I go to simulate more advanced things though. The fourth step in this section...
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    What to study in prep for writing a physics engine?

    I think the integrator I am using is called "Euler", or something similar. x = x + v*dt I wrote the code from scratch. I'm not all that interested in doing copy+paste coding. I'd rather understand what it is that I am doing. On a related note, why would doing the textbook exercises be a...
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    What to study in prep for writing a physics engine?

    First off, thanks for the detailed reply. Unfortunately though, I am already familiar with what you described. As I said in my first post, I have written three physics engines before, they were just error prone, unstable, and lacked some features. I'm looking for recommendations on what to...
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    What to study in prep for writing a physics engine?

    I'd like to first say that I'm not really sure which forum this is supposed to belong in. This one seems to fit best, but my question may be better in one of the math/physics forums... I'm planning on going through the resources Chris Hecker recommends in his article Physics References...
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    Center of mass of a uniform density square centered at the origin. Offset by width/4?

    I know it will be (0,0). I said as much in the post. I chose this because it is a simple example of finding the center of mass. I don't need to find this center of mass. I need experience finding the center of mass. Starting with known results is a very good place to start. At any rate...
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    Center of mass of a uniform density square centered at the origin. Offset by width/4?

    Homework Statement To get used to finding the center of mass of an object, I have decided to start with a uniform density square. The square is centered at the origin. The center of mass should be at the center of the square, and thus at the origin. When I tried to solve this however, my...
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    Alright, so in the truck example: A force F1 is applied to the truck to give it a forward acceleration "a". Relative to the truck, the box wants to move backwards. To prevent this, the truckbed applies a force of static friction to the box, Fb. Fb is opposed to the attempted motion of the...
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    That's what it seems to say here https://www.physicsforums.com/library.php?do=view_item&itemid=39 "it will always be equal and opposite to the total of the other forces on that body" Yeah I know, that's why I said "could be large". It depends on what is in the box (and what the box is made...
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    I keep running into a problem with that truck example. It's going to take a lot more force to budge the truck than to budge the box. From what I have read, you would compare the force required to budge the truck with the force of static friction between the truck and the box. The force of...
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    That's not the force I was referring to. Put in a possibly clearer way: "The point under the coin has a force applied to it which causes the point to have a radial acceleration. Static friction requires a force to counter in order to exist, so is this radial acceleration on the point the...
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    Is there a force which causes the static friction? From your post, it sounds like only velocities are involved in the calculation. Edit: This is in response to your earlier post, not your most recent one.
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    The reference frame is only rotating because of the static friction though. To say that the static friction is needed because it is a rotating reference frame doesn't seem like a very solid proof, and actually just seems to go in circles (not intended as a pun). I tried attacking the problem...
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    I care since it might explain where the friction force is coming from. I still don't understand how it is being generated.
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    But isn't the centrifugal force fake? How can something which is fake create friction?
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    Since the radial acceleration is from the friction force, doesn't that mean that the force which it is reacting to is pointing out? I don't know of a force which is doing that.
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    Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

    Homework Statement A coin is off-center on a turntable which is spinning at a constant velocity. The coin is not slipping. From what I have gathered, the radial acceleration of the coin is caused by the force of static friction on the coin. There is no tangential acceleration. Homework...
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    How was this ODE solution found? Doesn't seem to be the normal solution.

    Erm, sorry, but I don't see how that answers my question.
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    How was this ODE solution found? Doesn't seem to be the normal solution.

    Is my theory about it being a lucky typo correct then?
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    How was this ODE solution found? Doesn't seem to be the normal solution.

    Homework Statement The solution for the differential equation on this page http://electron9.phys.utk.edu/phys135d/modules/m5/Friction.htm#Drag [Broken] checks out, but I can't figure out how they found it. Both my solution and theirs check out. A couple people I asked for help reached the...
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    Reason for inter-box force size when force is applied to one side of a line of boxes?

    The purpose behind all of my threads in this forum so far has been to understand collisions better. This is a form of collision in my opinion, which is why I posted about it (even though the two objects are touching, a force is applied to one object which causes it to "collide" with the other...
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    Reason for inter-box force size when force is applied to one side of a line of boxes?

    Hmmm... I still don't understand how this all works. Trying to understand collisions is giving me quite a headache... I'm going to try reading a different article on physics. Thanks for the help though.
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    Reason for inter-box force size when force is applied to one side of a line of boxes?

    Hmm, alright lets go with your wall example. What happens the instant the wall is removed (assuming the wall completely vanishes in an instant)?
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    Reason for inter-box force size when force is applied to one side of a line of boxes?

    Here is the new version of the example: Thanks for the tip, I'll probably use this method from now on. However, the main issue still stands: Exactly what is causing A to apply a smaller force on B? As I said in a previous post, A doesn't care if B accelerates too far. Something must...
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    Reason for inter-box force size when force is applied to one side of a line of boxes?

    Thanks for the info, but it is still too vague... I've been sitting here thinking of ways to use that knowledge to solve the problem, but I haven't hit on anything. I'm looking for a reason why exactly the force decreases. What prevents the force of 1N from being applied to object B? Sure...
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    Reason for inter-box force size when force is applied to one side of a line of boxes?

    Homework Statement Note: To make this easier, gravity, air resistance, and friction do not exist in this problem. Given two boxes which are sitting directly next to eachother, and a force applied to the leftmost box in the rightward direction (straight at the other box), are there any...
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