Period+2+Exploring+Friction+Group+5

Exploring Friction media type="custom" key="26193060" Work through this lab as a group. Try to encourage everyone to be involved, have a voice, and use their skills!
 * Richie Baine**
 * Alex Benetz**
 * Ryan Rodriguez**
 * __Together with your group, come up with a name for your group in the spirit of our physics unit!__**
 * __Our Group Name:__** The 5th Dimension

Friction is the resistance that one surface or object encounters when moving over another, as force is applied to the object. Define these two types of friction:
 * __What is the definition of friction?__**

__**Static Friction –**__ Friction between two objects in contact that are not moving. Static friction is stronger or generally greater than kinetic friction and must be overcome before an object can be set in motion.

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
 * __Sliding Friction –__**

Use the blocks, masses, and spring scale to make observations on the amount of force needed to get a mass moving and the amount of force needed to keep the mass moving. Write down your observations. Observations:

Spring scales measure force. Weight is the force on an object due to gravity but a spring scale can also measure the force needed to pull an object. If the spring scale reads 100 g it means that the force is about 1 N. If the spring scale reads 200 g it means that the force is about 2 N.
 * __About the spring scale –__**

A triple beam balance measures mass in grams. Since w=mg where w is weight in N, m is mass in kg, and g is 9.8 (acceleration due to gravity) then we can convert the mass on our balance to weight using the formula below. Weight (N) = Mass (kg) X 9.8 or Weight (N) = Mass (g) X 0.0098
 * __About the triple beam balance –__**

__**Conduct an Experiment**__ 1. Experiment by pulling the block with the hook using the spring scale. Lay the block down on the table so that the largest surface is in contact with the table. Try applying such a small force that the block doesn’t move. What did the scale read when the block just begins to move? g = N This number represents the force of static friction between the block and the table.

2. Continue pulling the block across the table at a steady speed. What did the scale read as you pulled the block at a steady speed? g = N This number represents the force of sliding friction between the block and the table.

__3. **Create a data table to record the forces of static and sliding friction as you increase the mass of the blocks/objects you pull across the table. Be sure to convert the mass to weight using the formula above. Create another row for each set of blocks you pull.**__
 * Objects || Mass (g) || Weight (N) || Static Friction (N) || Sliding Friction (N) ||
 * 1 || 102.4 || 1 || 0.2 || 0.2 ||
 * 2 || 226.4 || 2.2 || 0.6 || 0.4 ||
 * 3 || 340.3 || 3.3 || 1.1 || 0.6 ||
 * 4 || 453.7 || 4.4 || 1.6 || 1 ||
 * 5 || 578 || 5.7 || 2 || 1.2 ||

__4. Stop and analyze the data in your table. Describe the relationship between the weight of the objects you pulled and each type of friction. What is the pattern seen in the table?__ As the weight goes up more friction is created between the two surfaces.

5. Create a graph to show the relationship.
 * **__Identify the independent variable for the x- axis:__** Weight
 * **__Identify the dependent variable for the y-axis:__** Sliding and Static Friction
 * **__What type of graph is appropriate for this set of data?:__** Scatter Plot
 * **__What can be done to distinguish the static friction data set from the sliding friction data set?:__** you can see two different colours
 * **__Create the graph using “Create a Graph” or paper and pencil__:** We are using the create a graph tool on the computer



As weight increases friction increases at a constant rate but it is different in how much force is applied for both sliding and static friction
 * __6. Stop and analyze the graph of your data. Describe the correlation between the weight of the objects you pulled and each type of friction. How is the correlation shown in the graph?__**


 * __Your Turn__**
 * __Choose a question from below or develop your own unique question with your lab group. Design and conduct an experiment to help find the answer to the question. Complete an experimental design diagram and have it approved before beginning.__**
 * 1) How would the amount of static and sliding friction change if the bottom block was placed so the smaller surface was in contact with the table?
 * 2) =__**How would the amount of static and sliding friction change if the blocks were placed on a different surface?**__ **(We are doing number 2)**=

Experimental Design Diagram

__**Question:**__ How would the amount of static and sliding friction change if the blocks were placed on a different surface __**Hypothesis**:__ I think when the amount of friction is increased that our force that we use to pull the block will increase greatly.
 * __Independent__ __Variable:__** Weight of the blocks

1 || 2.2 || 3.3 || 4.4 || 5.7 ||
 * Levels of the IV: || (Control)
 * Repeated Trials: || 2 || 2 || 2 || 2 || 2 ||

-Triple Beam Balance -Type of Blocks -Scale We will get two different types of surfaces such as rubber and glass, and we will measure the difference of friction against the different weights of blocks. We will test on the two surfaces of carpet and rubber. __Graph Analysis-__ The graph we made with using a different surface was different from the other graphs that we made because of the amount of friction on the blocks. Static and sliding friction rose on the graph because there was a greater amount of friction on the blocks. That was the only thing that changed, weight couldn't change because they were th same blocks, we didn't change the amount of blocks too.
 * __Dependent Variable:__** Sliding and Static Friction in Newtons
 * __Constants:__**
 * __Procedure:__**
 * __Data Table:__**
 * Objects || Mass (g) || Weight (N) || Static Friction (N) || Sliding Friction (N) ||
 * 1 || 102.4 || 1 || 0.2 || 0.2 ||
 * 2 || 226.4 || 2.2 || 0.8 || 0.6 ||
 * 3 || 340.3 || 3.3 || 1.2 || 1 ||
 * 4 || 453.7 || 4.4 || 1.6 || 1.2 ||
 * 5 || 578 || 5.7 || 2 || 1.4 ||
 * __Graph:__**