Freefall Tuesday

Happy Tuesday to you all :) I was home yesterday but am glad to be back today!!


Yesterday you did # 35, 36, 37, 48 & 49

Freefall is when an object is dropped. The only influence on the object is GRAVITY!!! AND when you drop the object, it speeds up as it falls so there is acceleration on the object...... acceleration due to gravity (g). g is a constant-- 9.8 m/s^2.  When the object is going in the down direction, g is negative.

Our old formula

**Solving for x (displacement) with NO final velocity  x=vit + 1/2 at2 (squared)

Still holds true for free fall….except that x becomes y (since our displacement is NOT horizontal but vertical instead) and the “a” becomes g (because g is the constant for acceleration due to gravity).  DO NOT rewrite the equation, instead just remember y instead of x and g instead of a J

y =vit + 1/2at2 (squared)  and g=9.81 (and usually negative)

 

HOMEWORK: Practice f page 64  

  NOTES LINKED HERE

FREEFALL EXAMPLES LINKED HERE

 

 

3/23/12

Today we had a 3 question quiz (12 points).  Be sure to be checking my blog. If you visit here, leave a message so I know you were here :) 

You were given time in class today and many of you did not use the time wisely.

DUE MONDAY: (from college prep packet)
22
27
30
31
32
33
34

3/21/12

Wednesday! :)

Today:
We completed page 58 problems 1-6, and page 59 #5. ALL DUE TOMORROW. 

Tomorrow: 
Media Center lab for time to work on the Rube Project. DUE 4-16-12. More computer lab time on 3/28/12 (Wednesday)

Friday: 
QUIZ over kinematics--solving for Velocity, Acceleration, Displacement, etc.

• Things to remember: 
• starting from REST gives you an initial velocity of 0.
• list ALL givens (example: Vi=56 m/s, x=3 m, t=?) PROVIDE labels for each given and answer
• Write your "final answers" OUT before putting into significant digits
• put your FINAL answer in significant digits but DO NOT ROUND in the middle of the problem. STORE your "answers" along the way to use for the final answer.

3/20/12

Today we did LOTS of kinematics practice using the College Prep Packet--Numbers 47, 16, 18 and 19.

You can see my work for #47 here.

Remember for #16 you are just calculating speed and velocity but you need to convert the km to m FIRST and min to seconds FIRST.

Remember for #18, you are calculating displacement over time for EACH chunk of the graph (or....slope :) rise over run) and REMEMBER that displacement has DIRECTION so one of those parts has a negative displacement.

Remember #19, you are calculating DISTANCE over time for each chunk (speed) AND displacement over time for each chunk (velocity)--REMEMBER displacement has direction.......

3/19/12 Conferences Tonight!

Happy Monday! Reminder: Parent/Teacher Conferences are tonight and we are offering extra credit if YOU attend with your parent/guardian :) Mr.Groh will be in the cafeteria and I will be in C111. You can see either of us!

Today we reviewed the FIVE Kinematics formulas

Today we also discussed how to put the solving for displacement Kinematics formula into the quadratic formula to solve for time.

3/14/12

Little energy form funny for you :)

Kinematics!

All FIVE Kinematics Formulas: 

WORK DONE TODAY:
College Prep Worksheet Page 55 10, 11, 12
Book Practice D page 55  1-4

VERY IMPORTANT: 

DO NOT ROUND your data in the middle--when you solve for something (such as x) that will be used in another formula (like then solving for Final Velocity)--STORE the MIDDLE DATA NUMBER IN YOUR CALCULATOR!!!