They See Me Rollin'

They calculate my moment of inertia...

Honors Physics went over their work on angular momentum and angular kinetic energy before moving on to simple machines. In grade 9, we lumped simple machines in with the work and energy chapter and that's fine. Both arenas, rotational motion and work are good ways to evaluate machines. We defined machines and began to look at how they functioned to make work easier. Actual and ideal mechanical advantage were contrasted and we will pick up with the families of machines and efficiency on Monday.

Physics B and F went over their torque work before beginning a discussion of rotational inertia. Objects do resist changes in rotation, but mass is not the only player. The distribution of mass is also important. Clustering mass around the rotational axis produces a lower rotational inertia than placing the mass at a distance from the axis. We'll build on this next week. On Monday, B's long block, look forward to a lab dealing with rotational equilibrium.

Physical Science got time in class to work on test corrections. Students can earn up to a maximum of 1/3 the points they missed back on their score. Next week, talking about lab write ups and continuing on with work and power.

Homework

Honors Physics, Physics B and F: None
Physical Science: Complete test corrections (if you get completely stuck on one, remember to ask me in class on Monday)