Physics : Mechanical And Chemical Interactions

During the water drops on a penny, we had an opportunity to make predictions and participate in several trials. Although participating in experiments is important, one way the classroom teacher could enhance the experience would you to have the students come up with a list of testable questions. Once the students have made their list of questions, allow the students to make a prediction, and then test their hypothesis. There were four groups of students each doing their own independent trails and asking their own questions, however, the results were very similar. Although, different techniques were used, the outcomes still allowed each student to have an experience observing surface tension. (See Question 1)

Of the alcohols tested 1-Butanol was found to contain the strongest intermolecular forces (IMF) of attraction, with Methanol containing the weakest. It was discovered through experimentation that Methanol induced the highest ?T of all alcohols tested, and that conversely 1-Butanol induced the lowest ?T. The atomic structure of all four alcohols is very similar, as starting with 1-Butanol a CH2 group is lost as you move from 1-Butanol to 1-Propanol to Ethanol and then again to Methanol. Each structure is fairly linear and contains an H-bond with Oxygen, so the real change is found in the loss of the CH2 group, this lowers the liquid’s Molecular Mass, thus lowering the London forces as you move from 1-Butanol through

1. Find the westward component of a resultant vector 85.42 unit, 23º W of N.

This is a simple equation that doesn’t properly prove the reaction. It is very complex and starts with this:

Something that can be learned from this data is that the sandpaper had the the most time. Therefore, it had the most friction. The material’s surface affected the speed it had. The aluminum foil had a very slippery surface. The aluminum foil went down the fastest on the ramp. Differently, the sandpaper went down the ramp slowly. The material’s surface affected the amount of friction. The sandpaper had the most friction because of its rough surface. Aluminum foil had the least friction because it had a smooth surface. To sum it up, the material’s surface has an effect on the amount of kinetic

The lab five B was about friction and how its always present. The purpose of this lab wat to explore how friction affect motion. There are three types of friction we discuss like air, rolling, and siding.

The lab 4.1 “What a Drag” was mainly about how friction affects most of our everyday things that people do or use . The “What a Drag” lab shows how friction can pull a block over 5 different surfaces. The different surfaces for each block has a different weight . On the Other hand, each of the surface area has a different surface but each blocks are the same.

. At in station 1and 2, students are encouraged to set their hypothesis and write down their predications, what they think? dose the wax have high or low melting point and boiling point, the third stations, dose the acetone conduct electricity or not?. To help students construct their explanations, I asked questions that push students to make connections to the real world. For example, in video 4, minute 0:56, I asked students what is the conductivity mean, the student answers, flow of electrons, To get him to

To discuss different types of chemical bonding in different substances (precursor to the next lesson topic)

Topic/Central Focus: Students will observe and identify what a chemical change in matter is. Students will do this through an experiment and discuss chemical changes as well. It is important for students to recognize and understand what a chemical change in matter is and how it can apply in their lives, such as cooking or cleaning.

2. Ozonolysis of compound Z yields the products shown below. What is the structure of Z?

The article “Toward roads that de-ice themselves” can be linked with our “Chemical Bonds” project. This article talks about a chemical compound that would be more efficient in de-icing roads than salt. As stated in the article salt alone wears away fast, and it has to be reapplied almost every day. The solution was a mixture of salt potassium and bitumen. This mixture was just as sturdy as before and it de-iced better than salt. The pros to this were that of it were embedded then it would last for years, it’s a better deicer than salt alone, and it was more effective. The cons were how expensive it would be to embed this compound into the streets. This connects with our “Chemical Bonds” project because it deals with making qualitative observations, chemical compounds, and chemical bonds.

Friction is the force that opposes the force applied on an object, as well as the motion of the object. The two types of friction covered in this lab are kinetic and static, but there are other types as well. Static friction ƒs opposes motion so that things do not move in relation to each other. Kinetic friction ƒk is the friction when objects are already moving in relation to each other. Examples of static friction and kinetic friction are riding a bike and moving furniture across the floor, respectively. It is important to note that friction is not dependent on the size of the area of contact between two surfaces assuming uniform surfaces. It is known that as the block pushes on the table, the table pushes back. This force is known as the normal force (ƒN) which is the equal force perpendicular to the object. In this experiment, it is noted that the table and room are stationary objects, and thus have no acceleration on them. This means that when the block is also stationary, the net force on the block is zero.

This is my report on my science fair project. My science fair is about car friction.

When two objects get in contact with each other the force between them forms. Scientists call this force the frictional resistance, or friction. It occurs because of the imperfections in the surfaces of objects, the molecules of both surfaces interfere with each other creating a natural force between two objects. The friction opposes direction of motion of the object and is parallel to the surface on which the action takes place. The force and magnitude that are necessary to overcome friction can be calculated. Area of objects that is involved in the contact is disregarded when calculating friction.