A toy train with a mass of 1.0 kg coasting at .5m/s overtakes and collides with a .25 kg cart moving the same direction at .3 m/s. When they collide they lock and continue forward.

1) Draw before and after momentum diagrams.

2) Is this elastic or inelastic?

3) What is the final speed of the carts?

CLO:

SW Investigate the variables which influence the pitch of a vibrating string, being able to write an explanation on how to change the pitch of a stringed instrument, using words learned during the investigation.

Physics Journals

Date Table of contents page #

11/19 The mu of the shoe ?11/3 Work / Energy / Power ?12/11 Momentum and Impulse ?

Semester 21/7 Conservation of Momentum ?1/14 Sounds in Vibrating Strings ?

Per 2: The following people didn’t turn in last week’s homework please meet with me to show proficiency on LOCOP

JamalIvanEvelynColin OliverDavidJustin

EmilyAgassiEliseAllisonMicah

Chapter 5, Section 1Sounds in Vibrating Strings

Pg 484Air Guitar try-outs

Homework: due Tue or Wed if not completed today

Read PT pg 486PTG pg 490 #2,3,6

Honors:IncludeAPP pg 488 #1-3

Investigate:Read Investigate pg 484

By the end of this investigation, have your 2 data tables filled in and answer the questions as you go

Team reader and other members:Materials:-Clamp -cup-Pulley -string- 500g mass -meter stick

This should take about 20 minutes max.

In your Journal:

Frequency: Number of vibrations (cycles) occurring per second.

Units:waves/scycles/s1/sHz

In your Journals, draw the following graphs: f

Tension

f

LDraw what you think the curve of each graph would look like. Quadralogue

Crucial PhysicsLet’s Look at the String Equation!

Copy in your Journal

f = _T___ 4 mL

Grab a white board and marker

White board challenge #1in your groups, place the units for each variable in the equation and solve for the units for frequency:T = kg.m/s2

m = kgL = m

f = _T___ 4 mL

Class share, What are the units for frequency?

White board challenge #2Now, looking at the equation, with your white board group, predict what you think a Tension vs frequency and Length vs frequency graph would look like

f = _T___ 4 mL

Class share

Pass out graph paper and fold in half f Tension vs frequency

T------------------------------------------------------------------------

f Length vs frequency

L

On your own, make the following table and using the equation, solve for “f” make m = 1, L=1: T f___ 4 8 12 16 20

f = _T___ 4 mL

Graph it!

On your own, make the following table and using the equation, solve for “f” make T = 4 and m=?: (if you double the length, what happens to the mass?) L _m_ f___ 1 2 3 4 5

f = _T___ 4 mL

Graph it!

You do:Next to each graph you just drew, explain the relationship between the two variables:

Stem #1:As tension increases, frequency ……………………

Stem #2:As length increases, frequency ……………………Pass in graph paper

You do

In your Journal, write a summary explaining how length and tension effect frequency of a vibrating string