1. students took makeup quizzes from unit 1

2. Unit 2 Force Notes

3. discussed new material for Unit 2H - Forces:

discussed video demo and developed Newton's 1st Law: An object will maintain a constant velocity unless acted upon by a net force

4. reviewed how pushes/pulls (forces) change motion (data here)...students came up with Newton's 1st Law: An object will maintain a constant velocity unless acted upon by a net force (defined as a push or pull in a particular direction) (summary here)

5. Discussed types of forces...developed the idea that the normal force is the force that a surface exerts on an object touching it...it is called the "normal force" since it pushes out always in a perpendicular, or normal, direction (force catalog here)

6. Today's recording

1. no livestream

2. students took Unit 1 Mechanics Exam

3. Today's recording (none today)

1. no livestream

2. Unit 2 Force Notes

3. discussed system schema...also called interaction diagrams - a diagrammatic method for determining the force interactions in a system ... schema notes here

4. began discussing the force diagrams associated with Unit 2 Practice 1 pages 1-3

5. Today's recording

1. no livestream

2. Unit 2 Force Notes

3. finished discussing the force diagrams associated with Unit 2 Practice 1 pages 1-3

4. performed the following experiment as a demonstration experiment: tggamm the relationship between the gravitational force, Fg and mass, m ... the result was Fg=(9.8)m where 9.8 had units of N/kg

5. students observed that 9.8 m/s^2 and 9.8 N/kg must be the same quantity...this allows us to define the N,

6. 1N=(kg)(m)/(s^2)

7. discussed the nature of the friction force: there is a static friction force and a kinetic friction force ... the friction force, Ff, depends on the coefficient of friction, mu, and the normal force, N in the following fashion: Ff=(mu)(N) via a friction experiment

8. Today's recording was not initiated. Please contact me via Remind for the video recording on these topics from another class.

1. no livestream

2. Unit 2 Force Notes

3. reviewed the experimental results about the nature of the friction force: there is a static friction force and a kinetic friction force ... the friction force, Ff, depends on the coefficient of friction, mu, and the normal force, N in the following fashion: Ff=(mu)(N) via a friction experiment

4. developed Newton's 3rd Law : Fa,b = - Fb,a .... showed a video demonstrating this law: go here

5. began solving simple problems involving the use of force diagrams

6. Today's recording

1. no livestream

2. Unit 2 Force Notes

3. continued solving simple problems involving the use of force diagrams

4. ran into a problem that involved an off-axis force ... discussed the process for replacing off-axis forces with components

5. discussed the PacMan Rule

6. discussed a physical situation in which a block is stationary on an incline...found mu given the angle of the ramp and the mass of the block

7. discussed more examples with Fnet=0 but with one or more forces off axis ... used PacMan Rule to quickly replace off axis forces with components in order to write and solve equations

8. Today's recording

1. livestream

2. Unit 2 Force Notes

3. discussed more examples with Fnet=0 but with one or more forces off axis ... used PacMan Rule to quickly replace off axis forces with components in order to write and solve equations

4. discussed a physical situation in which a block is stationary on an incline...found mu given the angle of the ramp and the mass of the block

5. Today's recording

1. livestream

2. Unit 2 Force Notes

3. discussed constant acceleration equation derivations

4. prepped students on Pivot Interactives Lab: Fan Cart: Force and Acceleration (this is due by Wednesday evening, 11:00pm). Students began taking data today in class.

5. students worked on Mastering Physics assignment due tonight, 11:59pm.

6. Today's recording

1. no livestream today - asynchronous eLearning day

2. Unit 2 Force Notes

3. students need to finish Pivot Interactives Lab: Fan Cart: Force and Acceleration (this is due tonight by 11pm).

4. no recording today

1. livestream

2. Unit 2 Force Notes

3. discussed results from Pivot Interactives Lab: Fan Cart: Force and Acceleration (this is due tonight by 11pm).

4. briefly discussed that F=ma is going to be used in situations that have unbalanced forces or accelerated motions

5. discussed several simple examples of applying F=ma to an unbalanced force situation

6. discussed two additional calc-based kinematics problems and after solving, talked about how F(t) = ma(t)

7. Today's recording

1. livestream

2. Unit 2 Force Notes

3. pop quiz 1

4. began discussion of the suite of Atwood's Machine problems (all with no friction) ... here is the video of a working Atwood's Machine we showed in class

5. Today's recording

1. livestream

2. Unit 2 Force Notes

3. Quiz 1 Retake

4. reviewed Atwood's Machine: here is the video of a working Atwood's Machine we showed in class

5. checked MIT video of Atwood's Machine against theoretical predictions (found actual to be very close to theory)

6. discussed modified Atwood's Machines

7. discussed how the magnitude and direction of a force could be determined if given the components

8. discussed Unit 1H - Practice 5 with special conversations on:

• elevator scale readings

• free fall in a jet (are the passengers "floating" or falling?)

• dropping a bowling ball and feathers in a vacuum chamber

• astronaut dropping a hammer and feather on the moon

9. students began UT Quest assignment QAPCM2 2021 (due Wednesday night)

10. Today's recording

1. livestream

2. Unit 2 Force Notes

3. watched dropping a bowling ball and feathers in a vacuum chamber

4. analyzed forces for block on top of block

5. discussed all forces involved in a two-block pulley system (CV)

6. discussed accelerations involved in a two-block pulley system (CA)

7. discussed more difficult problems (blocks and strings and blocks and pulleys)\

8. double angled modified Atwood's Machine (no friction) ... find a

9. discussed two blocks being pushed to the right with a CA...find the normal force between them

10. time left over spent by students on QAPCM2 2021

11. Today's recording

1. livestream

2. Unit 2 Force Notes

3. discussed additional Fnet=ma problems (likely from Mastering)

4. discussed Atwood's Machine problem...find m,T given motion info to begin with

5. discussed modified Atwood's Machine problem with block piggyback on block

6. discussed two block pull problems from MIT

7. discussed block on wedge, no friction anywhere...how big should F be to keep block at same position on wedge

8. time left over spent by students on QAPCM2 2021

9. Today's recording

1. livestream

2. Unit 2 Force Notes

3. students worked on M1-M2...gave students M3 and M4 to do for homework

4. catch up day for previous days activities

5. Today's recording

1. livestream

2. Unit 2 Force Notes

3. discussed solutions to M1 and M2

4. students worked AP Classroom quiz for N1/N2 in class as well as quiz on N3 (must do these now since AP Classroom is going to be down this weekend.)

5. students worked on M3 and M4

6. handed this review packet ... must be completed by Monday night. Pictures of work should be uploaded to Google Classroom by Monday night proving you worked these problems. Solutions will be provided for you to check your work.

7. Today's recording

1. livestream

2. Unit 2 Force Notes

3. students work practice exams and then check against correct solutions...students will upload pictures of their work to Google Classroom for credit

4. Today's recording

1. livestream

2. Unit 2 Force Notes

3. students take Unit 2 Exam

4. students do Pivot Interactives Lab: Three Views of Projectile Ball

5. Today's recording