This document discusses rotational kinetic energy and how to calculate it. It notes that both rotational and translational kinetic energy must be considered when using the law of conservation of energy. It provides an example of objects with the same potential energy at the top of an incline, but different times to reach the bottom based on their rotational inertia. Finally, it lists homework problems from page 221, numbers 43 through 48.

1. Section 8.7
Rotational Kinetic Energy

2. Rotational Kinetic Energy
 How do I calculate rotational kinetic
energy?

3. Rotational Kinetic Energy


4. Rotational and Translational
KE


5. Rotational Kinetic Energy
 When using conservation of energy, both
rotational and translational kinetic energy
must be taken into account.
 All the objects below have the same PE at
the top, but the time it takes to get down the
incline depends on how much rotational
inertia
they have.

6. Example


7. Homework
 Page 221, # 43 – 48