Friday december 11 09

Friday we reviewed our homework (acceleration problems 3). The formula (with the exception of 8.a) for all of the problems was (sf-si)/t=a. the plug and chug follow.

1. (1.3cm/s-0cm/s)/100.75=0.01cm/s/s
   
2. (142km/h-0km/h)/0.0009=157,777.78km/h/h)
3. (287.6km/h-0km/h)/0.003h=95866.67
   
4. (om/s-32.7m/s)/143.7s=-0.23m/s/s
   
5. (41.5km/h-0kkm/h)/0.058=715.517km/h/h
   
6. (2.4m/s-7.9m/s)/-3.65m/s/s=1.51s
   
7. 9.8m/s/sx2.7s+0m/s=26.46m/s
8. A)s=d/t____40km/2.3h=17.39km/h

B) (17.39km/h-0km/h)/0.51h=34.1km/h/h
____________________________--_______
After that we did a little bit of work on our acceleration/deceleration lab by posting our results on a Google dock sent to us by Ms.D a week or so ago

Reminders!!!!!!!!!!!!!!!!!
QUIZ ON TUESDAY
LAB DUE THURSDAY

• Directions for lab on your data sheet
• Study for the quiz using moodle
• 50%+ on math
• Study with Ms.D Monday during lunch

The next scribe is Vance

Friday, December 4

Hello 7th graders! Last Friday, we reviewed our acceleration math sheets. This was split into two parts. The front was easier questions, while the back was harder questions, with conversions and finding velocity or time. One example of an "easy" question was "A three toed sloth is moving at a speed of 2m/min. It takes 30 min to increase its speed to 15m/min. What is the sloth's rate of acceleration." First you needed the formula, which was acceleration=final velocity-original velocity/time or a=sf-si/t. Next, the plug. a=15m/min-2m/min/30 min. The answer is 0.43 m/min. The "hard" questions on the back were similar, apart from the fact that you needed to convert or that you needed to find something apart from acceleration. Something that may help you is this triangle, similar to the one from before.

The next scribe is Noam.

My fabulous blog.

First this class Mrs D told us how to do a right conclusion.

You need Distance, time and speed in your conclusion.

Your errors must be something that affects your data.

Mention +, - or no correlation in your conclusion.



After that Mrs D lectured us on Acceleration.

Acceleration is not speeding up. It is the change in velocity. (speed increasing, decreasing and changing direction.)

Increasing acceleration is positive acceleration while deceleration is negative acceleration.

An example of changing direction in acceleration is circular motion. Examples of circular motion is a ferris wheel or a satellite.

A geosynconised satellite is a satellite that is always above one point on what it is rotating about.

Math in acceleration.

m/s/s is the unit for acceleration.

The Formula for speed is Final speed - Initial speed/Time

a sample calculation of working out acceleration is...

Formula: F - S / T = a Plug: 10m - 0m / 10s Chug: 1m/1s/1s You can not have m/s/m

The Next Scribe Poster is !?@# Cip