numerical

Dot Physics

Category archives for numerical

Some Tips for Punkin Chunkin

I already attacked the 2008 Punkin Chunkin Show. So, now I going to give the chunkers some tips. In case you aren’t familiar, the Punkin Chunkin contest has teams create devices to launch a pumpkin. They have different categories, but I am going to focus on the air-powered devices. The basic idea is to make…

If you didn’t catch the latest MythBusters (yeah! new episodes), they did something straight from the physics textbooks. Just about every text has this example of shooting a bullet horizontally and dropping a bullet from the same height. The idea is that they should hit the ground at the same time. No one but the…

There were a couple of things that bothered me about the MythBusters’ myth where they fired bullets in the air. The myth was that a bullet fired in the air could kill you. The first problem is that it is not a myth. There are several reported cases of people being killed from bullets that…

How high does a bullet go?

You know I like the Mythbusters, right? Well, I have been meaning to look at the shooting bullets in the air myth for quite some time. Now is that time. If you didn’t catch that particular episode, the MythBusters wanted to see how dangerous it was to shoot a bullet straight up in the air.…

I created another screen cast showing how to get started with a numerical calculation for one of my classes. In this case, the students are attempting to model the motion of an object falling with air resistance. The following example doesn’t show the steps including the air resistance, but maybe it is enough to get…

Here is another one from a great podcast – Buzz Out Loud. I totally can’t remember which episode it was, I listened to a several in a row mowing the lawn and doing outside type work. Anyway, the discuss was along the lines of: Could an iphone tell if your parachute didn’t open with its…

Maybe you have seen this trick. Basically, you hold by supporting it with two fingers from the bottom. You then move your hand around to keep it balanced while the stick is vertical. It is really not as hard as it looks. Also, there are two things that can make your job easier. Use a…

Projectile Motion with a Spreadsheet

Basically, the title says it all. Here is a short tutorial on projectile motion calculations with a spreadsheet. Record your screencast online I left out a lot of details, so maybe these links will help: Spreadsheet tutorial for numerical calculations (video) More details on numerical calculations Projectile motion

I really didn’t want to post this, but I am going to anyway. I used ScreenToaster.com to make a screen capture movie (with audio) of a tutorial on spreadsheets. This should accompany my previous post on numerical calculations. Free online screen recorder

Throwing a football, Part II

In part I of this post, I talked about the basics of projectile motion with no air resistance. Also in that post, I showed that (without air resistance) the angle to throw a ball for maximum range is 45 degrees. When throwing a football, there is some air resistance this means that 45 degree is…