1. More Torque and Angular Information
Q3 D13 AP
More Torque and Angular Information

2. MINI LAB
Mini Lab of 5/10 minutes
Contacting me….

3. 3 Question Quiz

4. 3 Question Quiz

5. 3 Question Quiz

6. The Edge of the Door
Lets watch the door close. It consists of two motions: The door swinging shut AND the door coming to a stop.

7. STUDENT A: While the door was swinging, it had a constant angular velocity and a constant tangential velocity. That means that there was no acceleration at all during that time.
STUDENT B: While closing, there was an angular acceleration with the direction of the rotation AND a tangential acceleration opposite the velocity.

8. So a TANGENTAL FORCE caused the tangental velocity to change.
An ANGULAR FORCE caused the angular velocity to change.
That ANGULAR FORCE has a name: TORQUE!

9. BACK TO THE DOOR So the door needs a ANGULAR FORCE to stop it.
That ANGULAR FORCE is supplied from a regular FORCE at some distance from the PIVOT POINT.

11. Sierra says: Push 1 has all of its force causing a rotation, since it is perpendicular to the actual door. Push 2 has only part of the push causing it to rotate, which in this case the F*sinθ part of the force. The less perpendicular the force, the less rotation you get, but you can never have 0 rotation from the force.

12. So push 2 has a large TORQUE from that force, but push 2 has a smaller TORQUE from that force, since only part of the FORCE is making it TORQUE

16. VOTE

17. RANK THEM:
Ayman thinks: I know B is the most, since all the force is perpendicular and r is the largest. And C is the least since it has not all the force perpendicular. For A and D, I think A and D are the same, since that extra rod part does not factor into the r distance since its at the same angle as the force.
AGREE/DISAGREE

18. TORQUE BAR
Lets keep the same force, but change its placement. What would happen to the torque needed to balance it?
PIC:

19. TORQUE BAR
Lets keep the same placement, but add string to the mass to make it hang farther down. What would happen to the torque needed to balance it?
PIC: