April 27, 2007

We started the class off by going over questions 1-5 that was for homework. The answers are on the previous blog that Ms K posted up....

BTW: question #5 is for bonus marks. so if you want the extra marks i think you should do it.

After our fellow students helped the class with the homework questions there was a sheet handed out with the "Inverse Square Law" lyrics on it. Ms K played the song for us which was .... very interesting :/

K well anyways. we got another sheet about Inverse-Square Law (the one with the diagrams [paint spray & hand])

if you didn't get the answers to this... here they are...

question 1:
1 area unit = 1 mm thick
4 area units = 1/4 mm thick
9 area units = 1/9 mm thick
16 area units = 1/16 mm thick

question 2:
5 m from source? 25
10 m from source? 100


Ms K then handed out another sheet which covered "Gravitational Interactions"
This sheet will help you understand how to use the equation
F=G(m₁m₂/d²)

(sorry i dont know how to do subscripts or even superscripts or whatever... sorry)

answers:
1) if both masses are doubled, what happens to the force?
Fnew = G(2m₁2m₂/ d²)

2)If the masses are not changed, but the distance of separation is reduced to 1/2 the original distance, what happens to the force?
F = G(m₁m₂/ ½d²)

3)If the masses are not changed, but the distance of separation is reduced to ¼ the original distance, what happens to the force?
F = G(m₁m₂/ ½d)²> = 1/(1/16) = 16F


4)If both masses are doubled, and the distance of separation is doubled, show what happens to the force.
F = G(2m₂2m₂/ 2d²) = 4/4 = 1F

5)If on of the masses is doubled, the other remains unchanged, and the distance of separation is tripled, show what happens to the force.
F = G(2m₁m₂/ 3d²) = 2/9 = 2/9F

6)Consider a pair of binary stars that pull on each other with a certain force. Would the force be larger or smaller if the mass of each star were three times as great and if their distance apart were three times as far? Show what the new force will be compared to the first one.
F = G(3m₁3m₂/ 3d²) = 9/9 = 1F

this sheet is more about understanding how to use the equation and how to interpret what's being asked and form it into an equation...





okay well there's another sheet given... "Universal Law of Gravitation"

We just worked on this worksheet until class ended so if you did this then good job...your on task and ready for more work :) that's the end of my scribe and yes i guess i have to choose the next one which is....lemme see ?!?!? ...gear321