วันพฤหัสบดีที่ 1 มีนาคม พ.ศ. 2561
- Inflate a balloon, and tie the end. With a permanent marker, draw an X on one side of the balloon.
- Your partner holds a funnel over a large bowl and pours a cup of water through the funnel. As the water gently flows, bring the balloon as close to the stream of water as you can without getting it wet. Record your observations in your Science Journal.
- Next, rub the X side of the balloon on your sweater, and then hold the balloon next to the spot where you rubbed. Observe the interaction between your sweater and the balloon. Record your observations.
- Rub the X side of the balloon against your sweater again. Immediately repeat step 3.
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.
-The charge interact with the friction.
2. Key Concept Why do you think the balloon interacted the way it did with your sweater and with the stream of water?
- Opposite charges attracts, like charges repels.
What color does a sheet of white paper appear to be when viewed through a red filter? red
What color does a sheet of white paper appear to be when viewed through a blue filter? blue
Shining the flashlight through the paper and putting the purple filter on the camera lens
Without the purple filter
Taking a photo with the red filter
Taking the photo with the yellow filter and a dual hand lens
These are photos taken with different colored filters on the camera lens and light beams from flashlights
Blue filter on the camera lens
Shining light through an orange filter creats orange light
Shining light through a purple filter creats purple light
Shining light through a red and blue filter creats purple pink light
Shining light through a red and green filter creats orange light
Shining light through a green filter creats green light
Shining light through a blue filter creats blue light
Shining light through a red filter creates red light
1. What force is responsible for the difference between the weight of each object in the air and its apparent weight in water?
- Buoyant Force
2. How is the buoyant force related to the weight of water displaced?
- The force is upward so it negates the gravity force pulling downwards.
- The more buoyant, the less water is displaced.
3. Define buoyant force and describe 2 ways you can measure it or calculate it.
- The upward force acted upon a submerged object.
- Using spring scales and using Archimedes's principle.
4. Explain what causes an object to sink or to float, using the terms buoyancy, weight, force, density, and gravity.
- An object floats because there's a lot of buoyancy supporting it. Buoyant force lessens the weight of the object so it negates the gravity and make it floats. But the object with more density wouldn't.
วันพฤหัสบดีที่ 21 กันยายน พ.ศ. 2560
Crystallization of milk lab
1.Why do we add salt to ice?
Ans: Salt decrease the temperature which helps it cools easier.
2.Why do we add the cookies and other things, only after the milk has frozen slightly
Ans: It will make the frozen milk tastier.
3.What are two factors that affect the freezing you think?
Ans: Ice and milk
4.Why do you need a bit of air in the bag?
Ans: In my opinion, the air inside will be the space when milk vibrates and air can change the temperature inside.
วันเสาร์ที่ 10 มิถุนายน พ.ศ. 2560
How could you use the densities to identify the minerals?
-if density is the same, it will be the same type of mineral.
Would density or color be more useful in identifying a particular mineral? Explain your answer.
- both because it helps to identify both.
Irregular rocks volume finding lab
We tried to find the mass and volume of the irregular shaped rocks and find the density
No. Mass Volume Density
6 11.11 22.22 50
2' 213.5 2.135 100
11 98.5 1.97 50
7 49.5 0.445 100
3 45 0.9 50
5 115.1 2.302 50
5' 45.7 15.23 3
3' 25.6 0.512 50
9 199.9 2.6653 75
12 146.3 2.926 50
2 136.2 1.816 75
7 12.56 25.12 50