## Wednesday, 18 January 2012

### Algebra Change of Subject 2

In the previous lesson, you have uncovered the implication of 'change of subject' and the processes involved.

collaborative work

using TI-Nspire to

build your foundation on the key concept using examples presented in a collaborative environment.

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Pair work

based on the activity in task 1, reflect on the processes involved and write it down on your worksheet 5.
Identify at least 2 points for consideration for 'Change of Subject'.
You may discuss with a partner in class.
Submit this at the end of the lesson.

reference:
Worksheet 5, ACE learning.

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individual work

Extension of understanding on Change of Subject

Identify a formula in other subject areas (other than Mathematics)
- define which subject area the formula is applied and what the formula is about
- define all the variables used
- identify a variable (other than the one presented) to make a subject.
(ensure that this is possible)
[post this as a comment - do not include your solution[

example:
Subject: Physics
This formula is about the motion (movement) of an object
v = u + as
v - final velocity
u - initial velocity
a - acceleration of object
s - displacement
Question:
Make a the subject of the formula.

1. abiyyu arif rahman1/19/2012 10:49 am

Arithmetics Error - division
transfer error - plus/minus sign

transfer error - positive/negative indication
arithmetics error - division of the incorrect terms

3. 1) Try to avoid arithmetic errors such as failing to multiply or divide correctly, resulting in deriving the wrong answer.
2) When carrying signs (+,- etc.) to the other side of the equals to sign, change the symbols

4. Subject: Physics and Astronomy
This formula is about the amount of energy is the amount of mass a body has.
E = mc^2
E - Energy
m - Mass
c - Speed of light

Question:
c=√E/m

5. 1) There is an error about the misconception that x+4=q (q) is actually q+4=x.
2) The second error is actually an error about dividing error of incorrect terms

6. Arithmetic error-division
Transfer error-forgot to change the sign when transferring to the other side.
(Done with Kang Xiong)

E=mc^2

E=energy
m=mass
c=speed of light

Arithmetic error division of the wrong terms
Transfer error: plus/minus sign is confused

Geography
R/r
R=Rise
r=run

Transfering error - negative and positive places

Arithmetic errors like the incorrect division and the wrong results from a certain equation as well as errors such as transferring of wrong signs as well as positive and negative signs.

Done with Desiree

Esther Tiey:
Transfer error - plus/minus sign
Suppose to divide but multiples.

Physics
Distance = Speed x time
Fine Speed

When dividing, make sure that you also divide the other side of the statement.

When transferring subjects, make sure that you change the signs.

13. Transfer errors. (-) Negative and (+) Positive.
Arithmetics Error. Division, Multiplication, etc.

14. Errors:
Transferal Error: For example: x=3b+4
x+3b=4 (When the person transferred 3 over, he forgot to switch the sign to minus.)

Arithmetic Error: Some people are just careless and does some of the operations wrongly.

Transfer errors. (-) Negative and (+) Positive.
Arithmetics Error. Division, Multiplication, etc.
Done with Daniel.

Done with Jasmine
1) Miscopied
2) Left out alphabets
3) Forgot to multiply/divide
4) Wrong usage of signs
5) Moving mistake, instead of +/- becomes the other way around

2 Considerations/Errors:
1. Arithmetic error, eg. Forgot to divide both sides by the same value
2. Transfer error, eg. + was not converted to - when changed sides

Distance = Speed x Time

Make Time the subject

Chemistry:
CO+O₂=CO₃
Make O₂ the subject

20. Boon Pin & Boon Pin Task 2:
Crossover:
1) + ➔ -
2) - ➔ +
3) × ➔ ÷
4) ÷ ➔ ×

Remember to factorize and group like terms, it helps

21. Physics
G = mgh

G - Gravitational Potential Energy
m - mass
g - gravitational field strength
h - height

Make the subject the height.

Gravity: mgh
mass × gravity force × height

Physics:
KE=(1/2)(m)(v^2)

KE=Kinetic Energy
m= mass
v=velocity

Find the velocity

24. Phsyics:
Moment
FxPerpendicular Distance = M

Energy
KE=(1/2)mv^2
make v the subject

26. Speed of an object is Distance/time
making speed as the subject

27. Speed = Distance / Time

Make time the subject.

28. Physics
G = MGH
Mass x gravity force x height

Make mass the subject

29. Distance = speed x time

make time the subject