## Monday, 2 April 2012

### Homework for 2/4 Official troll day.

Science

- If you have not finished your energy worksheet, then you will have to do until page 15.

For absentees

- Mr Chan went through Pg 5 today, so you are supposed to do that.
> The answers are (LOOK ONLY AFTER YOU HAVE FINISHED IT!!!)
m: mass of the object
g: gravitational field strength
h: height of object from reference point

For Pg 10:

a) 5 x 10 x 5 = 250
Ans: 250 Joules

b) 250 + 20 = 270
Ans: 270 J

c) 270 / 50 = 5.4
Ans: 5.4 M

For page 11

1000                         0                                 1000
500                           500                             1000
0                               1000                           1000
250                           750                             1000
1000                         0                                 1000

For page 12

b) Point B

i) Gravitational potential energy is converted to kinetic energy as the skater moves down. At point B, half of the amount of gravitational potential energy is converted to kinetic energy.

c) Point C

i) Gravitational potential energy is converted to kinetic energy as the skater moves down. At point C, all the gravitational potential energy is converted to kinetic energy thus the skater has the highest speed.

d) The sum of gravitational potential energy and kinetic energy is always the same.

e) Friction and air resistance is negligible.

And then you do until page 15 and I am not going to tell you my answers.

I&E

- For the groups that have not done their classification for your spreadsheet, then that is your homework.
> Remember to share the spreadsheet with Ms Choo

Higher Chinese