Wednesday, September 20, 2017
1) Why do we add salt to the 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
Wednesday, June 7, 2017
Calculate the density of each of your mineral samples. How could you use the densities the minerals?
Ans : Yes, because if density is the same, it will be the same type of mineral.
Key Concept Would density or colour be more useful in identifying a particular mineral? Explain your answer?
Ans: Colour because it is easily observed, but not always a reliable characteristic for the identification of minerals.
Density us useful because each mineral has a characteristic density (density does not vary with the size of the mineral).
Wednesday, May 24, 2017
The first thing I think is acid rain, actually, there are many ways to affect the environment but, the most area is a lake. It makes the water absorb the aluminum from the soil surrounding it which make the water more toxic so the animals that live there gonna die. The second thing is the air pollution when we burning things so gas will be toxic. The last one is the effect from the oil spill because it gonna make toxic to water
Wednesday, February 22, 2017
The Effect of Gravity on Speed
Gravity provides a constant acceleration (force) on an object. The effect is changed by using ramps at different angles. In this lab, you will find the optimal angle to maximize acceleration on a ball bearing so it travels the farthest and/or the fastest. Friction is the opposing force created by the surface interactions. Whenever something rolls due to a force, friction will oppose this force and slow it down.
Ramp Ball Bearing
Graph Paper (2) Ruler
1. Put the ramp against the seat of a chair. Place the ramp and chair so that the ramp points towards the hallway. Have your teammate on the other end of the hallway.
2. Place the ball bearing at the top of the ramp.
3. Lift the ramp 20 cm and release the ball bearing
4. Time how long it takes to travel 5 meters.
5. See how far it will go..
6. Repeat the experiment three times for each height then do 40 cm, 60 cm, and 80 cm.
Time to travel 5 meters
Observations: When the height is high, the time is short, the height is low the time is long
1. Describe how the ball rolls off the ramp at each height—discuss the effect of bouncing or other factors.
: When the height is high the ball will bounce and the distance also shorter than the ball that doesn't bounce.
2. Discuss what is the fastest speed reached and any factors that could improve this.
: 2.98 s
3. Does the ball travel in a straight line, why or why not?
: No, because it is circle so it can go anyaway.