WORK Tuesday

NOTES


ASSESSMENT TOMORROW over Chapters 5, 6,7--READ!~

Schedule for the Week and 6, 7, 8 notes

Monday: Chapter 6, 7, 8 Notes and get all tests from the semester (staple together in order)

Tuesday: Study for exam and Chapter 6, 7, 8 Assessment 

Wednesday: Chapter 6, 7, 8 Assessment  and study for exam time    **collect books

Thursday: Study 

Friday: Exam and turn in ALL tests as a packet

NOTES: 

Work is done when a force moves an object some DISTANCE (displacement)!!

Work has direction--positive and negative--can cancel each other out to have a displacement of 0)

Work=Force times displacement (W=F*d)   (direction matters so label + or -)
Work label is JOULE (J) and remember Force=m*g or weight
 
(a meter/newton is Torque)





The more powerful machine it can do more work in a certain amount of time. Power is work divided by time. P=W/t   
Label: Joules/seconds.....WATTS


 Kinetic Energy and Potential Energy: The unit is joules. Because there has to be work to get either one of these types of energies. 

KE=1/2 mass * velocity squared  (just velocity is squared....)   and label is joules 

PE= 
potential elastic: storing something in something stretched (like a rubber band)

potential gravitational: 

PE_e=1/2 k x²

K is spring constant and x is displacement

PE_g=mgh 

Potential Energy gravitational= mass times acceleration due gravity times height

Law of Conservation of Energy: 

• energy cannot be destroyed
• it can only change forms or states  

 

D Day

Today was EGG DROP DAY! :)  Those of you who were below our 6 x 6 will get the chance to redo some tests! Great job :)

We also provided time to review notes for the final exam--remember on Monday we will be giving you back ALL old tests for you to look over and review for the final exam.

Have a great weekend~:)

Review for Test

Egg Drop DUE THURSDAY!!!!!!!

something to think about ..........weight = mass * acceleration due to gravity  (w=mg) so if you are GIVEN weight, then do not multiply it by g...........

Dynamics Review

Review of Friday Monday

So since Groh was gone Friday, I had no time to post so here is the review of Friday plus a few "tid bits" for thought...................

homework due Friday that we will actually check it tomorrow so do it........

• Practice D 1-3 page 139 
• Practice E 1-4 page 141

when you push an object or pull an object with NO angle...... Normal Force = mass * acceleration due to gravity

when you have an angle, you have to take into account the F in the y direction and if you are PULLING IT you add F in y to the Normal force to equal mg and if you are pulling it....Normal Force=mg + Force in the y

Examples Galore

we saw Groh fly Thursday

FRICTION notes

2nd Law Wednesday

Practice C page 132 
1-5

The difference:

·        Gravity—Force that pulls us down (N)

·         G—universal constant (just a number) 

          g—acceleration due to gravity (m/s²)

 Because of Newton's 2nd Law: F=ma and therefore w=mg (weight=mass * acceleration due to gravity)

**remember we do everything in SI system....newtons, kilograms and m/2 ^2) 

  Link for the above notes in pdf format

Universal Law Tuesday

Labels: 

Force=Newtons (N)
Mass=Kilograms (Kg)
Distance=Meters (m)
Acceleration=m/s squared

CLASS ASSIGNMENT: Page 128 Practice B, # 1 and 3
reminder: draw a picture, then make into a free body diagram

another reminder: F=ma 

Newton's Universal Law of Gravitation 

Just another Newton Monday

Review of Force Information from Friday: 

Newton's Laws of Forces (click here to see the notes)
Tomorrow there will probably, most likely, quite certainly be a quiz on the three laws of forces....... perhaps, maybe you should study :)