Rotational motion introduction

This is for the 3 Chem/Phys classes. In addition to gravity and the pendulum, there is the transition from linear motion to rotational motion. Rotational motion is like spinning wheels, where every point of a full object spins. This is different from circular motion, which is motion of something we can treat as a point mass moving on a circular path.

For our pendulum lab, for instance, we treat this as circular motion because we are only considering the mass at the end, and ignoring the string. Technically, if we include the string, then we would need to discuss it in terms of rotational quantities.

These rotational quantities are introduced in this video. Check it out, take notes on the new symbols and terms and relationships - the relationships are analogues to what we do for linear motion. See if any of it makes sense with a few practice problems, which can be found in the 3 Chem-Phys page of the website, in the Rotations folder. The files is called Packet - Rotations Intro. Some practice is on page 5. *Note that with rotational equations and values, we are converting into radians for angular measurements. Work together and talk things through.

Try: Ch. 9 #1, 3, 7, 9, 11           Think about the similarities to linear motion problems we have had.

*For any groups that need to collect more data for the lab, go for it. If you need to do the force sensor part, we'll wait for Wednesday when the software is available.