3-16

Monday, March 16 Today, we started class with a homework check on page 11-13. The homework was assigned on friday, march 13. The homework was about centripital force problems and also centripetal acceleration problems. For the homework check, we put problem number 4 in a half sheet of paper and turned it in. The answers for the 4a. is 9.7 m/s² and 4b is 5936.97 N. After we handed the paper in, we reviewed that answers for page 11-13. The class also asked questions about the problems they got confused with. After we finished the review, we talked about a new concept of __Rotational Inertia and Torque__. Mr. Manning made us read the new paper about Rotational Inertia and Torque. We talked about how mass and radius affects an object's rotational inertia. We also found out that if something is rotating, then it continues rotating about a fixed line in space. If it is stationary, then it stays stationary. Mr. Manning made a demonstation on a spinning table. We found out that moving the mass closer to the axis increases the rotation but the rotation will decrease if the mass is held farther form the axis. So all in all, mass and radius affects the rotational inertia!!! This is the last thing we did in the class because the juniors had PSSAs wich shortened the period to 30 minutes. There might also be a test on friday March 20, so everyone should study the concepts and the formulas for centripetal force and acceleration.

New Papers: Rotational Inertia and Torque Notes ( pg 14 )

Concepts: Centripetal Force Centripetal Acceleration Rotational Inertia Torque

Tomorrow PSSA Review Rotational Inertia and Torque

Alexander Nuique