Science+4

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Welcome to your class wiki! In this space, it is my hope that we will be able to creatively share with others what we are learning in class. This space is yours to collectively and collaboratively communicate your knowledge and understanding of scientific concepts.

2-19-08 During the month of February we have been studying mixtures. We have learned about solvent and solutes and how solutes dissolve in the solvents to make a solution. The solutes effect the freezing and boiling point of solvents by lowering the freezing point and raising the boiling point. The solvent is more present in the mixture. The solute is less present. Water is the universal solvent. Suspension mixtures are when you can see the things that that make up the mixture. Solutions are when you can not see the things that make up the mixture. We also learned ways to take these mixtures apart. Some ways are by filteration, by letting the substances settle, and by chromotography. There are also many other ways. The formula for concentration is percent equals mass or volume solute over mass or volume solution miultiplyed by 100.

In rotation, since we have been learning about mixtures, we mixed oil paint, paint thiner, and water together. After we did this we put a piece of paper into the water and the paper soaked up the paint mixture and water. It came out to be a kind of design from how the paint was in the water. And we learnd about suspention so during roatation we mixed some oil paints in with water. And the oil paint floated on top of the water. And we put paper on top and we made really cool pieces of art.

3-10-08 Since we have been learning about speed and volecity in class, we took cars and marbles and let them go and measured how far they went and how long it took them to get that far, and measured the distanced. Yesterday we measured distance by setting cars down a ramp, and we shot a marble then got the speed of how fast they went. media type="custom" key="587485"

3-11-08 Today we explained the difference between an Independent variable and a Dependent variable.Today we learned about the difference between velocity and speed.

3-17-08 Today we learned about momentum and velocity and how they are different.Today we also dicussed the formula for momentum and velocity.

3-18-08

Today, we did an experiment with marbles. During the activity, we discovered that a bigger marble has more mass, Thus, it has more momentum making a smaller marble move. For example, if a massive truck has a collision with a smaller car, the smaller car with bounce off of the bigger car, going backwards. In conclusion, the more momentum an object has, the farther and faster a smaller object will go in a collison.



3-20-08 Today we spent our entire class going over the homework from last night!! YAY!!! Our homework for Easter break is the big ol' study guide that our teacher gave us!!! How fun!!!! bye bye! =)

4-1-08 Today we had our Pssa's, so we are just making videos for all of our fans1111 =) Today is our teacher's birthday so her homeroom had a party with cake!!!!!! YAY!!! =)

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4-14-08 In class today we did an experiment on friction. We dragged blocks of wood across different surfaces such as wax paper, sand paper, and card board. We noticed that it is more difficult to pull the wood over sand paper than wax paper due to the friction between the two objects.



4/17/08 Yesterday we learned about energy (especially mechanical energy). Mechanical energy is the ability to cause a change in motion. The mesurement of mechanical energy is Newton meter (Nm). The two energy forces of mechanical energy are kinetic and potential

5-19-08 In science class we learned about pulleys. We learned that fixed pulleys do not reduce the force needed to move an object it just changes the direction in which you move an object. Also we learned that there is 3 types of pulleys movable, compound, and block and tackle. Movable pulleys reduce the effort needed to the object in half. The MA (mechanical advantage) of a pulley is calculated by the number of ropes that supports the object. So if there is two ropes used to lift the object the MA is two.

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