May
23

Password to access protected areas of this website

To access any protected areas of this website with physics content please look at the right-hand side of the graphic at the top of the page.  To access copyrighted UIL materials please contact me for your password.

Why have I done this?

In an effort to continue to make my content freely available to my students, parents, colleagues and other educators, but to keep “web-bots” from stealing content from this domain, I have embedded the password information into the graphic at the top of the webpage.  The password should open all publicly accessible portions of this site and you should only have to input it once and your browser will store it (unless you have extremely tight security settings on your web browser).  If you have any problems accessing course content or if the password does not appear to work, please contact me as soon as possible.

Dec
13

Tutoring during finals week

 

Day

AM

PM

Mon. (12/15)

7:40

3:30 – 5

Tues. (12/16)

7:40

3:30 – 5

Wed. (12/17)

7:40

None

Thurs.(12/18)

None

Duty/None

Fri. (12/19)

None

None

Dec
08

AP Rotation 2–The bowling ball slippage problem

This problem is an issue of conserving angular momentum.

 AP-Rotation-2-Bowling_ball_problem_updated

Dec
08

AP Rotation 2 problem #17 correct diagram

Click on the image for a higher resolution photo:

Dec
05

AP-C: selected AP rotation solutions for practice

AP-C rotation practice selected solutions

Nov
18

AP Physics C: Momentum #2.6

A block of mass m1 = 2.0 kg slides along a frictionless table with a speed of 10 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 4.2 kg moving at 2.8 m/s. A massless spring with spring constant k = 1100 N/m is attached to the near side of m2, as shown in Fig. 10-35. When the blocks collide, what is the maximum compression of the spring?

Solution: Based on the problem you can treat the two objects as undergoing an inelastic collision.  Where does the energy go?  It gets stored in the spring!  So the spring does work on the system.  Hold that thought, it will be important soon.

Step 1) Since we know both Vi’s and we know both masses, we can solve for the final speed of the combined mass using conservation of momentum.  Now we know Vf.

Step 2) You know both Vi’s and the combined Vf, so you can calculate the total KE before the collision and doing it again gives you after the collision.  Find the delta KE before and after the collision.

Step 3)  Where did that lost KE go?  We said it earlier.

Step 4) So the spring did work which sucked up energy.  How much?  The difference you calculated in Step 2).  Why is this important?  W=deltaKE.  Oh.  That’s why its important.  So,

W=deltaKE (<–you know this number)
.5kx^2 =deltaKE
Solve for x.

YeeHaw!

 

Nov
18

AP-C Momentum 2.7

Number 7 from the second momentum HW

AP momentum 2.7

Nov
15

AP-1: 2D forces review materials

2D-forces-quiz-KEY
A-Day: This is your quiz from Friday.  Please study and make sure you can reproduce my results.  You will get your quizzes back to review prior to your exam on Monday.  Many of you did very well, with only a few errors.
B-Day: If you are looking at this message you may as well take advantage of this quiz above, but your’s will now be substantially different, although the same principles will be assessed.

2-d-motion-study-guide-updated 2014
Updated from what’s in your packet.

 PreAP-notes-2D force inclined plane non-equilibrium
Notes from a prior class year, different examples and numbers, but same scenarios we looked at.

Be sure to review projectiles, including your last quiz and the items previously posted.

Nov
14

AP-C: Momentum problems and quiz key

APC momentum quiz KEY and extra problems

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