## 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.

========================================================
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.

========================================================
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. Subject: Physics
This formula is about the distance an object would go with the amount of speed and time it has.
d = st

d - distance
s - speed
t - time

Question: Make t the subject of the formula.

2. This comment has been removed by the author.

3. Subject: Physics

This formula is to calculate the total gravitational potential energy of an object (GPE)

GPE = Height X Mass X Gravitational Field strength

GPE = HMg

Make M the subject of the formula

4. Subject: Physics
This formula is to calculate the acceleration of an object.
st = a

s = Speed(In which Speed = Distance x Time)
t = Time
a = Acceleration

5. Subject: Chemistry

(Volume)

The formula to calculate area is different for different shapes.

L x B x H

L=length
H=Height

6. This comment has been removed by the author.

7. Subject: Physics
This formula is to measure how heavy one cm^3 of an object is

The formula is (M)ass / (V)olume =(D)ensity

Make M the subject.

8. Subject: Geography

Gradient: (b - a)/(d x m)

b = longer rise
a = shorter rise
d = distance (measured by ruler)
m = distance (scale; converted to meters)

9. Subject: Physics
This formula is to calculate turning moment of an object.
fd = m

f = Force applied
d = Distance from pivot
m = Turning moment of object

Question: Make d the subject.

10. Subject : Physics
This formular is to calculate the distance of an object with the given speed and time.
d = s x t
d = Distance
s = speed
t = time
Make d the subject of the formula.

11. Subject: Physics

This formula is to calculate the distance an object would go with the amount of speed and time it has.

d-distance
s-speed
t-time

Question: Make s the subject of formula.

12. Subject:Chemistry
this formula is to find the chemical structure of water.

the formula is 2 parts of hydrogen+1 part of oxygen.

13. Subject: Physics

This formula is used to calculate the total GPE of an object.

GPE= mass x height x gravitational field strength

14. Subject: Physics

The formula is to calculate the kinetic energy of an object.

KE = 1/2 MV^2

Variable:

M = Mass

V = Velocity

Make V the subject of the formula.

15. Subject: Physics

Kinetic Energy

m=mass
v=velocity

½mv²

Make V the subject of the formula

16. Subject: Physics
Mass and the speed of light are a concept of energy.
e = mc^2

e = energy
m = mass
c = speed of light in a vacuum

17. Subject : Physics
The formula is to calculate the distance from the given speed and time
d=st
d is distance
s is speed
t is time
make s the subject of formula

18. Subject: Physics

This formula is to calculate the amount of kinetic energy in an object.

KE=GPE while stationary.

Total energy - GPE = KE
GPE= Gravitational Potential Energy
KE= Kinetic Energy

Find KE when GPE is 500J

19. Subject:Physics
This formula is to calculate the amount of force needed to change the direction of a moving object.
v-a=f
v= velocity of moving object
f=Force used to push the object to the other direction
a=force leftover after pushing the object.

Make a the subject?