Physics 1070

Online Resources Lectures (password)

http://www.physics.umanitoba.ca/~mammei/Teaching/1070/Lectures/

WileyPlus (instructions on following slides)

https://www.wileyplus.com/WileyCDA/Section/Fundamentals-of-Physics-Extended-9th-Edition.id-402894.html

Student Companion Site http://bcs.wiley.com/he-bcs/Books?action=index&itemId=0470469080&bcsId=5586

Course website (password)

http://www.physics.umanitoba.ca/undergraduate/phys1070/

Wednesday, January 8, 2014 1

http://www.physics.umanitoba.ca/~mammei/Teaching/1070/Lectures/














http://bcs.wiley.com/he-bcs/Books?action=index&itemId=0470469080&bcsId=5586







WileyPlus If you purchased a new textbook in the bookstore, it came with a WileyPlus

access code (if you have an account from a previous PHYS 1050 or 1070 class, you can use the old login, if you have switched from 1020/1030, please contact me ([email protected]))

Go to https://www.wileyplus.com/WileyCDA/Section/Fundamentals-of-Physics-Extended-9th-Edition.id-402894.html and follow the instructions for login

Once logged in, you can access problems on the "assignment" tab (note: while this is called "assignment", there is no due date and no grade will be assigned, this is strictly for voluntary practice)

Problems on our "recommended problem list” are generally listed at the top, all other end-of-chapter problems follow

Under the tab "Read, Study, and Practice" you will find an electronic version of the textbook and other resources


mailto:[email protected]














3

• Turn on power switch and hold for 2 sec.

• Channel indicator will flash. • Use response buttons A-E to set the

channel posted in the classroom.

Channel indicator

Power switch

Response buttons A - E

Setting the frequency

Wednesday, January 8, 2014

4

• Turn on the power switch. • Check that classroom frequency is set right. • Use response buttons A-E* to submit your answer. • When the process is complete, a histogram will be

displayed, and the correct answer highlighted • Questions and answers will be discussed in class.

* (If you want to change your response, just choose again while the question is open.)

Answering questions


5

Practice Question


Which of the following describes how you spent time on PHYS 1070 since the last class?

A. I registered my i>clicker online

B. I read chapter 15 up to section 4

C. I tried the problems suggested at the end of class

D. I read the introductory section of the lab manual and I’m ready for next week’s lab

E. All of the above

po

siti

on

time

+x

0

-x

velo

city

time

+v

0

-v

Mass on a spring


-1

0

1

0 1.5708 3.1416 4.7124

Sinusoidal functions


ttx cos)(

tdt

tdxsin

)(

t

dt

tdx

dt

d

dt

txdcos

)(2

2

t

-1

0

1

0 1.5708 3.1416 4.7124

t

-1

0

1

0 1.5708 3.1416 4.7124

t

Sinusoidal Functions in SHM


txtx m cos

amplitude

angular frequency

phase constant

time

position as a function of time

fT /1

Tf /22

# whole waves per s

# radians per s

)( Ttxtx What are 𝜑, 𝜔 and xm as shown in the plot, assuming a cosine function? A. 0 rad, 𝜋 rad/s, 1m B. 0 rad, 1 rad/s, 1m C. 0 rad, 1 rad/s, 2m D. 𝜋/2 rad, 0 rad/s, 1m E. 𝜋/2 rad, 1 rad/s, 2m

-1

0

1

0 1.5708 3.1416 4.7124

t(s)

x(m

)

3602

2

90 180

2

3

270 360

2

sin_functions_l2.xlsx

Sinusoidal Functions in SHM


txtx m cos

amplitude

angular frequency

phase constant

time


fT /1

Tf /22

# whole waves per s

# radians per s

3602

txdt

tdxtv m sin

)(cos 22

2

2

txtxdt

txd

dt

tdvta m

)(2 txtaF )(txF SHM

kxF Hooke’s Law

spring constant

2mk

Question


15.2.1. Object A is attached to ideal spring A and is moving in

simple harmonic motion. Object B is attached to ideal spring B

and is moving in simple harmonic motion. The period and the

amplitude of object B are both two times the corresponding

values for object A. How do the maximum speeds of the two

objects compare?

A. The maximum speed of A is one fourth that of object B.

B. The maximum speed of A is one half that of object B.

C. The maximum speed of A is the same as that of object B.

D. The maximum speed of A is two times that of object B.

E. The maximum speed of A is four times that of object B.

Example: mass on a spring


http://higheredbcs.wiley.com/legacy/college/halliday/0470469080/simulations/sim15/sim15.html

mglk

“Vertical” SHM

Friday, January 10, 2014 12

txtx m cos

amplitude phase constant

time


kxFs

angular frequency

spring constant

sF

gF

mgFg

x

xl

l

l

ll

0)( mglkF

mgxlkF )(

kxmgkxlk

gs FFF

x

Question


15.2.3. A steel ball is hung from a vertical ideal spring where it

oscillates in simple harmonic motion with a period T. At time t =

0 s, the ball is at its maximum displacement, A, from its

equilibrium position. In terms of the period, at what time will the

ball be at y = 0.75A?

A. 0.33T

B. 0.25T

C. 0.19T

D. 0.15T

E. 0.12T

For next time

Read sections 15.5 to 15.7

Check out oscillation web demos at

Wiley companion site

Do questions 4, 5 and 12

Do problems 4, 8, 9, 17, 18 and other suggested problems (see course website)

Contact me with questions!


Physics 1070

Documents

Transcript of Physics 1070