# Recent content by InvisibleMan1

1. ### 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. ### What to study in prep for writing a physics engine?

Alright, thanks for the information.
3. ### 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...
4. ### 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...
5. ### 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...
6. ### 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...
7. ### 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...
8. ### 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...
9. ### Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

Thanks for the help :)
10. ### 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...
11. ### Friction force, what causes it? Unslipping coin on spinning turntable w/ constant vel

So how does the friction force work in the truck example?
12. ### 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...
13. ### 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...
14. ### 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...
15. ### 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.