numerical

Dot Physics

Category archives for numerical

More on turning and braking

I can’t let it go. There is more here to explore. First, I can’t believe that I looked at braking and then turning but not turning then braking. And what about braking while turning? I will model braking and then turning – but it won’t stop here. Consider a few motions. I could turn and…

Basketball shot – real or fake?

I have seen several videos similar to this. Real? Fake? How many tries did this take? Let the analysis begin. Before I do any analysis, let me state that I think this is not fake. I do not know that for sure, just my first guess. How would I tell if it is real or…

(alternate title: how to make pretty graphs in vpython) I am happy. Finally, I can use the visual module in python (vPython.org) and plotting with Matplotlib. Maybe this isn’t such a big deal for many of you, but for me, it never worked until now. In the past, I blogged about plotting in vpython vs.…

Chased by a Zombie

Title: Chased by zombies When I heard word about the ScienceBlogs Zombie Day, I knew I wanted to participate with a post – but I had no idea what to do. My first thought was to somehow talk about living off the electric grid in the case of a zombipocolypse – you know, like how…

Star Trek Space Jump

While I am still fresh on the Space Jump topic, let me take it to the extreme. Star Trek extreme. SPOILER ALERT But really, is this a spoiler alert if it is from the trailer of a movie that has been out forever? Of course, I talking about the latest Star Trek movie where three…

A new video from the Red Bull Stratos Jump guys came out. Here it is: This reminds me of an unanswered question about the Stratos jump that I didn’t address on my last post on this topic. Commenter Long Drop asked about how much Felix would heat up as he falls from 120,000 feet. This…

Debris field for a broken meteor

I happened to catch two parts of two different episodes of Meteorite Men – a show about two guys that look for meteorites. In both of the snippets I saw, they were talking about a debris field for a meteor that breaks up. In these fields, the larger chunks of the meteorite are further down…

Pendulum, let it go

This is a requested post. Clearly, I do requests. The idea here is that I am going to give all the details needed to determine the equation of motion (and then model it) for a basic pendulum. Warning: this post is a little more advanced than my normal posts. There are some prerequisites. You need…

Pendulum – a third way

Looking back at part I of this idea, I don’t think I did a very good job. Let me summarize the key things I wanted to say: Normally, there are two ways of modeling the motion of an object: Calculating the forces on the object and using the momentum principle or Newton’s second law (which…

Mechanics an Example of the Pendulum

This post has been sitting in my mind for quite some time. Really, it is about mechanics – not about pendulums. What is the goal in mechanics (classical mechanics, if you like)? Generally, it is to find out how something changes over time. If you could get an equation of motion, that would do it.…