Wednesday, 21 February 2018
Table of pulley lab
|object||weight in air||apparent weight in water||buoyant force (weight in air-apparent||pulley weight in air||length of string|
Wednesday, 14 February 2018
Think About This
1. Infer Why did you rub the balloon on your sweater? Predict what might have happened if you simply touched the balloon to your sweater instead of rubbing it.
-When one object is rubbed against another, static electricity can be created. This is because the rubbing creates a negative charge that is carried by electrons.
-If you just simply touch it there aren't any change transfer so there aren't any friction.
2. Key Concept Why do you think the balloon interacted the way it did with your sweater and with the stream of water?
Because the charge is uneven; therefore, it need to make contact to balance it self (equal)
Wednesday, 10 January 2018
Wednesday, 15 November 2017
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
Color by subtraction
first, take two color card and stick it together then get the flashlight and shine through it and take a look at the color.It forms a new color due to the two-color that's overlapping with each other.
so by adding blue and green together the result is stunning! Wow! Green!
and by adding blue and red together the result is also stunning! Magenta!
r+g= yellow r+b=magenta b+g=green
work with another group—put a color paddle over the flashlight, shine on white paper—so a red, a green, and a blue
Color by addition
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--
r+g=white r+b=white b+g=white
view white paper through color paddles—record results
view colored objects through color paddles
It will form a white color on the paper sheet, unlike the subtraction one which will form a new color.
First, choose two color card and shine through it separately (do not put them together like the first one)
Wednesday, 13 September 2017
1) why do we add salt to the ice?
to decrease the temperature
2) why do we add the cookies and other things, only after the milk has frozen slightly
otherwise, it will melt together with the milk while it's tending to freeze.
3) what are two factors that affect the freezing you think?
4) why do you need a bit of air in the bag?
To help it to move forward and backward.(easier to move)
Wednesday, 7 June 2017
7)Calculate the density of your minerals samples. How could you use the identities the densities to identify the minerals?
If the object density is the same it's the same but if the density is not the same it's not the same
8) Key concept would density or color be more useful in identifying a particular mineral? Explain your answer
Colors because it makes it's more clear to identify which one is it.