More Torque and Angular Information

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Presentation transcript:

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

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

3 Question Quiz

3 Question Quiz

3 Question Quiz

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.

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.

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!

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.

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.

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

VOTE

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

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

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: