1. Review of Semester 1 information

2. With a distance of 1.5X10 11 m away, the Earth revolves around the sun. How far (in meters) has Earth traveled in a half of a year? A full year?

3. What is the angular displacement of a minute hand from 10:30 AM to 12 AM?

4. What is the angular acceleration of Earth as we revolve around the sun in space?

5. Let’s imagine that the all of a sudden, the gravitational pull between the sun and Earth ceased to exist and we fell off our orbit in a tangential direction. What would the velocity of Earth by as we flew off into the universe? (distance from Earth to Sun is 1.5 X 10 11 m)

6. Which causes more torque, holding a wrench close to the nut/bolt system or hold the wrench further away from the nut/bolt system? I can only exert a force of 55 N on a wrench when trying to loosen a nut/bolt system. If the bolt will begin to move with a torque of 8.5 Nm, how far away should I place my hand on the wrench?

7. Initially, a ball has an angular velocity of 5.0 rad/s counterclockwise. Some time later, after rotating through a total angle of 5.5 radians, the ball has an angular velocity of 1.5 rad/s clockwise. (a) What is the angular acceleration? What is the average angular velocity? How much time did this take? (b) At some point the angular velocity of the ball had to have been zero. At what angle from it's initial orientation did this occur and how long did it take?

8. Moment of Inertia The measure of resistance to angular acceleration – Inertia: resistance to change in motion/acceleration – Dependent upon torque and angular acceleration – The net torque on a system is equal to the product of the moment of inertia of that system and the angular acceleration of that system

9. Calculating moments of inertia We are going to create a table on a left page 12 boxes (3 columns of 4 rows) Top left box title: Moments of Inertia Table

10. NBC Learn

11. Guided and Independent Practice