วันจันทร์ที่ 26 กุมภาพันธ์ พ.ศ. 2561

วันพุธที่ 21 กุมภาพันธ์ พ.ศ. 2561

Pulley 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

 

 

Balloon lab

1. Infer Why did you rub the balloon on your sweaterPredicwhat 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 unbalancenegative chargeBecause the sweater lost electronsit haan unbalanced positive chargeBoth insulators and conductors can be charged by contact.


2. Key Concept Why do you thinthe balloon interacted the way it did with your sweater anwith 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.

วันพุธที่ 15 พฤศจิกายน พ.ศ. 2560

Lab Color




Lab Color

Activity A: 
 1. look at the monitor
 2r+gr+bb+g
 3.  work with another group—put a color paddle over 
flash light, 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--




 


วันพุธที่ 13 กันยายน พ.ศ. 2560

Crystallization of Milk Lab

Procedure

First step: We pour the milk into the bag and close it
Second step: We put ice then add salt to make the ice stick together.
Third step: We use test tube rack to push up the ice on the milk bag to make it freeze.
Fourth step: When the milk is already frozen, add topping and chocolate sauce.


1)  why do we add salt to the ice? 
        - To make the ice stick together.
2)   why do we add the cookies and other things, only after the milk has frozen slightly
        - They will make our milk ice-cream 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?
        - Because it will be more space of milk to move in the bag and make it free 


วันพฤหัสบดีที่ 25 พฤษภาคม พ.ศ. 2560

Writing Assignment

Three things about the impact of society

1. Coal pollution
Coal contains sulfur and other elements, including dangerous metals. When it's burned, it makes air pollution because so many dangerous gases from the coal blew up to the air.

2. Acid rain
Acid rain results when sulfur dioxide and nitrogen oxides are emitted into the atmosphere and transported by wind and air currents. When acid rain falls down, it can destroy land and houses.

3. Oil spill
Oil spill is the release of a liquid petroleum hydrocarbon into the environment. It frequently kill marine mammals and can cause damage by contaminating their food supply.