Notes on problems 7.22, 38 and 68

This video discusses how to approach problems 7.22, 38 and 68.

Circular Motion.

This post includes two videos.  The first one is on the derivation of the formula \(a=v^2/r\), which represents the relationship between acceleration, speed and radius for an object moving in a circle. This equation answers the question: what acceleration would you need to induce something to move in a circle?
Derivation video here:

Midterm return, Wednesday, May 30

Your graded midterm exams will be returned on Wednesday, May 30. Please try to be there to pick up your exam or arrange for someone else to pick it up for you.

If you were not able to get your midterm, please contact the section TAs. (see post below for contact info)

Same procedure as previously for regrades.

Midterm Review Session 5/22, 3:20-4:55 in EMB214

Hello avid learners,

Thanks to the tireless work of our physics admins, we have a review session booked! I will cover general content and test taking strategies, facilitate work on the practice exam, and answer any physics questions your hearts desire. Show up eager in

Earth & Marine Sciences B214 on
5/22 (Tuesday) at
3:20 - 4:55 PM.

Happy studies,
Michael

Equation sheet for midterm 2

Here is the latest draft of the equation sheet for midterm 2. If you can find any errors here, please let me know by commenting below, or by email if you prefer. Your help is really appreciated!

Midterm Instructions.

If you last name begins with A-L, you take your midterm in our regular room, E&M B206.

Collisions: Video and Notes from class.

This "blackboard" shows some of the things discussed in the video below, which discusses inelastic and elastic collisions, and how to solve two equations with 2 unknowns. It includes novel as well as traditional methods.

Video and Notes follow here:

Midterm2 notes and practice problems. Please prepare and bring your own table for cos.

Please prepare a table of values of the cosine function (with the argument in radians). That is, \(cos(\alpha)\), where \(\alpha\) is in units of radians and ranges from about -pi to pi (or 2 pi if you prefer). You can bring that with you to the midterm. I would suggest including all 1/4 and 1/6 fractions of pi in that range. Here is a rough example of the sort of thing I have in mind, but the one you make should have a better set of values of alpha (all 1/6 and 1/4 fractions of pi) and could be neater and more systematic. You can include a graph of \(cos(\alpha)\) and \(sin(\alpha)\) as well.

You can also bring a similar table and graph for the sin function.

Collisions and momentum. HW 7 solutions.

This week we will introduce momentum and look at how momentum conservation is used in modeling collisions. Momentum conservation means that the momentum is the same before and after a collision.  (This is covered in chapter 11 of "Knight".)

HW 6 Solutions

HW6 solutions:

May 9 & May 11, notes and video.

This class (May 9) we looked closely at the nature of cos and sin in the vicinity of "zero argument".

May 7, class notes & video.

Class notes from May 7. This is all about the the motion of a mass attached to a spring. That is, the sort of motion that occurs when the force comes from an ideal spring. (F(t)=-kx(t)).

2nd Midterm, May 23rd

Our 2nd midterm is scheduled for May 23rd.

Midterm pick-up.

If you did not get your midterm already, the best way is to email one of the section TAs and come to section and pick it up there.  (See schedule and info 2 posts below.)

HW 5. Motion when the force comes from a spring, F(t) = - k x(t). Class notes, video and solutions.

Position: Our starting equation for motion when the force comes from an ideal spring is:
\(x(t) = A cos(\omega t + \phi_o)\)

Discussion section schedule.

• Michael's sections: 
• T 3:20-4:20 PM/ISB 235
• Th 3:20-4:20 PM, 4:20-5:20 PM/ISB 235
• EMAIL: msaccone@ucsc.edu
• OFFICE LOCATION: ISB 292

• Dana's  Sections:
• SECTION LOCATION: ISB 235 & Thimann 391
• SECTION TIMES: 
• Th 8:30-11:30 AM ISB 235, 
• F 10:40 AM-1:40 PM Thimann 391.
• EMAIL: dfaiez@ucsc.edu
• OFFICE LOCATION: ISB 292

(For more information, see also April posts (far below): Introduction to Michael, and Introduction to Dana.