Test Friday (Safety and Collisions)

To the back of the room:-Determine your Mass off egg and compartment-choose a spokesperson to explain your design-have your rubric out for official grades-Typed components level 3 will be accepted no later than tomorrow morning.

warm up Number your paper from 1-201. Mass2. Time3. Energy4. Acceleration5. Force6. Applied Force7. Work8. Velocity9. Net Force10. Frictional force11. Kinetic Energy12. Force of weight13. Gravitational Potential Energy14. Acceleration15. Acceleration due to gravity16. Inertia17. momentum18. Pressure19. Elastic Potential Energy

Content Objective:SW be introduced to Big Idea #5 for the class, and brainstorm ideas which can be used to evaluate “Entertainment Value” for Chapter Challenges.

Language Objective:We will know the objective was met when we can come to consensus on what will be needed in order to develop and present a quality chapter challenge.

Big Idea #5

The Properties of Sound and Light Demonstrate Wave Behavior

Let Us Entertain YouChapter Challenge pg 480

Brain Storm:What are the qualities of an Entertaining

Presentation?http://www.youtube.com/watch?v=8TrvKg1Xb2k

Pre testWaves and Energy

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?

Collect Projects

What’s on the test?

Content / Language Objective:

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.

Chapter 5, Section 1Sounds in Vibrating Strings

Pg 484What do You See?What do You Think?

Homework: due Monday

Read PT pg 486CU pg 487 #4 PTG pg 490 #2,3,6

Honors:IncludeAPP pg 488 #1-4

Investigate:Read as class

Copy the data table on page 485Team reader and other members:Quietly read steps #1-4Material Specalists:Meet me in the back Once your set-up go to step #3 -Clamp -cup-Pulley -string- 500g mass -meter stick##3-4 10 minutes#5-6 10 minutes (3 more masses)

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=1: L 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 ……………………Tape / staple into your journal

You do

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

Do now:1. Which of the following statements describes the

relationship between the pitch heard and the vibration rate of a string under tension?

a) As the vibration rate increases, the pitch increases.b) As the vibration rate decreases, the pitch increases.c) As the vibration rate increases, the pitch decreases.d) The vibration rate and the pitch heard are not related to each other.

2. Which of the following are the units for Frequency?vibrations / s cycles / s Hz 1/s waves /

s