## Wednesday, February 21, 2018

### Pulley Weight LAB

 Object Weight in Air Apparent weight in water Buoyant force Pulley weight in air Length in String 1 10N 7N 3N 10N 44cm 2 4.2N 3.2N 1N 4N 40.5cm 3 2N 1.75N 0.25N 1.2N 40cm 4 1.9N 1.6N 0.3N 1N 37.5cm 5 0.9N 0.75N 0.15N 0.75N 37cm 6 0.4N 0.3N 0.1N 0.75N 32.5cm 7 0.15N 0.1N 0.05N 0.5N 31cm 8 0.1N 0.05N 0.05N 0.25N 28cm 9 0.05N 0.005N 0.045N 0.2N 24cm

## Wednesday, February 14, 2018

### Balloon Lab

1. Infer Why did you rub the balloon on your sweaterPredict what might have happened if you simply touched the balloon to your sweater instead of rubbing it.

ANS. Sweater holds electrons more loosely than the rubber balloonWhen the balloon comes in contact with the sweaterelectrons from the surface of the sweater transfer to the surface of the ballooncreating static charge on both objectsBecause the balloon gained electronsit has an unbalanced negative chargeBecause the sweater lost electronsit has an unbalanced positive chargeBoth insulators and conductors can be charged by contact.
2. Key Concept Why do you think the balloon interacted the way it did with your sweater and with the stream of water?
ANS. When you rub the balloon you touch the balloon to your hairs. when this happens a few electrons are transferred from the hair to the balloon. Rubbing repeats this millions of times, leaving the balloon charged.
The water starts off neutral, with the same amount of positive and negative charges. When you bring the charged balloon near to the water it pushes electrons away, leaving a positively charged area which is attracted to the balloon.

## Wednesday, January 10, 2018

### Vector Mapping

Direction (Lab)

Art room

First step: You take a Walk at 268 degree west straight for 11 steps

Second step: You turn up at East 82 then walk up 2 Storey of stair

Step 3: You take a West 267 for 13 steps

Step 4: Turn left at South 176 degree

Last step: walk 79 steps then you will reach your destination

## Wednesday, November 15, 2017

### Lab: Colour

Activity A:
1. look at the monitor
2. r+g, r+b, b+g
3.  work with another group—put a color paddle over flashlight, shine on white paper—so a red, a green, and a blue
Activity b
3.  view white paper through color paddles—record results
4.  view colored objects through color paddles
5.  if you have time, do activity b—color by subtraction--

 Filters On paper Filter only Light red red blue blue green green yellow yellow purple purple red+green brown(yellow) brown yellow orange red+blue green green blue+green blue green blue green turquoise blue+green+red black black white purple+yellow red red

## questions

1)  why do we add salt to the ice?
Salt decreases the temperature which helps it cools easier.
2)  why do we add the cookies and other things, only after the milk has frozen slightly?
It will make the frozen milk tastier.
3)  what are two factors that affect the freezing you think?
Ice and salt
4)  why do you need a bit of air in the bag?
In my opinion, the air inside will be the space when milk vibrates and air can change the temperature inside easier.

## Wednesday, June 7, 2017

 Sample no. Weight g. Volume ml. Density g/ml. 11 98 20 98.25 6 110.5 74 108.05 7 60 243.5 1 125 20 125.3 5(s) 45.5 13 45.7 5(b) 114.5 48 113.2 9 199.6 78 200 3 28 25 28 2 136.4 72 13.06

calculate the density of each of your mineral samples. How could you use the densities to identify the minerals?
If the densities are the same, the objects are the same. If the densities aren't same, the objects are different.
Key Concept Would density or color be more useful in identifying a particular mineral? Explain your answer.
I think density is more useful, it is more accurate becuase it will be the same ratio but one mineral can be more than one color.