Monday, April 25, 2011

Hi guys! If you miss today's class here are the things that we did.
In the beginning of class Ms. K let us watch videos explaining Kepler's Law of Planetary Motion. If you're unfamiliar with Kepler's three laws, refer to your gray booklet in pages 6&7.

After we watched the videos, we went over Transparency 7-1 in page 21-22. Here are the answers to the questions:
1. gravitational force
2. elliptical
3. at one focus of Earth's elliptical orbit
4. at the point closest to the sun
5. at the point farthest from the sun
6. area(1)=area(2)
7. T(1)=T(2). Since the Earth's velocity varies, the time it takes to sweep out equal areas along its orbit is the same.

Lastly, for tomorrow's class we are to finish pages 15-18.

Projectile Motion continued

During today's class we went over the ivory booklet pages 10, 15,17,18,23, and 24.
On page 10: Tossed Ball Problem
The answers are as follows:
20 m/s
10 m/s
5 m/s
5 m/s
11.2 m/s
20.6 m/s
30.3 m/s

On page 15: Transparency 6-1 Worksheet
The Trajectory of a Projectile
1. the highest point of the projectile has the smallest magnitude because ate this point vertical velocity equals zero.
2. their the same in magnitude but different in directions.
3. their the same in magnitude and directions.
4.


On page 17: Transparency 6-2 Worksheet
Vertical and Horizontal Projectiles
1. they are the same
2. they are the same
3. the horizontal motion does not affect the vertical motion
4. it is because of the vertical spacing between the ball's motion is changing
5. it's because the horizontal distance between the red ball's motion are the same

On page 18:
Projectile Motion I


On page 23:
Projectile Motion II


On page 24:
Chapter 7 Review


Don't forget that the "On Target" lab is due tomorrow.