Chandra :: Educational Materials :: Stop for Science!

COLLECTED BY

Organization: Archive Team

Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.

History is littered with hundreds of conflicts over the future of a community, group, location or business that were "resolved" when one of the parties stepped ahead and destroyed what was there. With the original point of contention destroyed, the debates would fall to the wayside. Archive Team believes that by duplicated condemned data, the conversation and debate can continue, as well as the richness and insight gained by keeping the materials. Our projects have ranged in size from a single volunteer downloading the data to a small-but-critical site, to over 100 volunteers stepping forward to acquire terabytes of user-created data to save for future generations.

The main site for Archive Team is at archiveteam.org and contains up to the date information on various projects, manifestos, plans and walkthroughs.

This collection contains the output of many Archive Team projects, both ongoing and completed. Thanks to the generous providing of disk space by the Internet Archive, multi-terabyte datasets can be made available, as well as in use by the Wayback Machine, providing a path back to lost websites and work.

Our collection has grown to the point of having sub-collections for the type of data we acquire. If you are seeking to browse the contents of these collections, the Wayback Machine is the best first stop. Otherwise, you are free to dig into the stacks to see what you may find.

The Archive Team Panic Downloads are full pulldowns of currently extant websites, meant to serve as emergency backups for needed sites that are in danger of closing, or which will be missed dearly if suddenly lost due to hard drive crashes or server failures.

Collection: Archive Team: URLs

TIMESTAMPS

CHOKE UP ON THAT BAT!

THAT'S FAST!

WHY DO WE NEED TO PUSH THINGS
TO GET THEM TO MOVE?

Things don't start moving by themselves. If something is at rest, you have to push it to get it going. For a push of a given size, some objects will move more easily than others. Inertia is a measure of how much something resists being put into motion. Mass is a measure of inertia. The more massive an object is, the harder you have to push to get it moving.

WHAT ABOUT MAKING SOMETHING ROTATE?

To get something to rotate, a twisting force has to be used. But it is more than just the mass that determines how hard it is to rotate something. It also matters how far that mass is from the point around which you are trying to rotate. If most of the mass is close to the center of rotation, it is easier to make it rotate. For example, a disk will roll more easily than a ring with the same mass and size.

BASEBALL PLAYERS ARE SCIENTISTS?

"I'm sure that of all of the home runs I hit, at least half of them came when I was choking up slightly."
Ted Williams

When the pitcher is bringing the heat, Megan gets a jump on the ball by choking up on her bat.

Well, some might be. But almost all of them know that it is harder to get good “bat speed” with a big, heavy bat. When a pitcher is throwing the ball at 100 miles per hour, the batter has less then a second to hit the ball, so getting the bat around fast matters! If a batter wants to be able to swing a bat more quickly, they choke up on the bat. This puts the heaviest part of the bat a little closer to where they are twisting the bat with their wrists.

The next time you play baseball, do an experiment. Take your favorite bat and try choking up on the grip a little. You’ll find that you can swing a little faster, and that’s a good thing! Tell your coach

"IT'S ALL ABOUT ROTATIONAL INERTIA!"

TRY IT!

ROTATIONAL INERTIA (Example: Twirling a baseball bat.) Hold a bat horizontally in your hand, gripping it in the middle. Twist it back and forth to rotate it, like in the figure above. Now grip that same bat all the way at the end and try to rotate it again. It is much harder. That’s because the mass is farther away from the rotation axis.

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