Group+5

Together with your group, come up with a name for your group in the spirit of our physics unit! Gravitational Pull of Friends Zach M., Will Derr, Josh S., Bryanna C. media type="custom" key="26193152"
 * Exploring Friction **
 * Our Group Name:**
 * Work through this lab as a group. Try to encourage everyone to be involved, have a voice, and use their skills**

What is the definition of friction? The resistance that one surface or object encounters when moving over another,as forces applied to the object Define these two types of friction: Static Friction – ====**Friction ** between two objects in contact that are not moving. **Static friction ** is generally greater than kinetic **friction ** and must be overcome before an object can be set in motion. ====

Sliding Friction – Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: ⁕Dry friction resists relative lateral motion of two solid surfaces in contact.

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: I found that 295 grams is equal to 300 newtons. I also found that 147.5 grams is equal to 150 newtons.**

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 –**

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.//
 * Conduct an Experiment**

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 || 102.5 || 1.025 || 0.4 || 0.2 ||
 * 2 || 227 || 2.27 || 0.8 || 0.4 ||
 * 3 || 332 || 3.32 || 1.2 || 0.8 ||
 * 4 || 446 || 4.46 || 1.8 || 1 ||
 * 5 || 577.5 || 5.775 || 2.2 || 1.4 ||

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? The relationship of the objects is that the heavier the object the harder its to pull. Static friction throughout the whole experiment was more newtons then the sliding friction. Static friction had more newtons because it had a lot of potential energy when finding the static friction. The reason sliding friction didn't have a lot of newtons is because it didn't have much kinetic energy.

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: Static
 * What type of graph is appropriate for this set of data?: XY Scatter Plot
 * What can be done to distinguish the static friction data set from the sliding friction data set?: Different Colors
 * Create the graph using “Create a Graph” or paper and pencil.

. 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?

Friction increased as we increased the number of blocks. The weight and friction increased at a steady rate, the friction increased almost by .2 while the weight increased by 1.

Friction increased as we increased the number of blocks. The weight and friction increased at a steady rate, the friction increased almost by .2 while the weight increased by 1.

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. __Experimental Design Diagram__ __Question:How would a different surface affect the amount of newtons of force on the objects? Carpet__ __Hypothesis:I think that you will need a lot more force to pull these objects across the floor__ __Independent Variable:__ __:Static and sliding friction__
 * Your Turn**
 * 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?


 * Levels of the IV: || (Control)  Object 1 || Object 1+2 || Object 1+2+3 || Object 1+2+3+4 || Object 1, 2, 3, 4 and 5 ||
 * Repeated Trials: || 1 || 1 || 1 || 1 || 1 ||

__Dependent Variable: force of newton applied__ __Constants:Carpet__ __Procedure:__ __1. First we will Find carpet__ __2. Make sure the big flat side is facing down.__ __3. Third we will test object 1 then object 1 and 2 then object 1, 2, and 3 then we will test objects 1, 2, 3, and 4 then we will test all the objects__ __3. then we will record our data__ __Data Table:__ __Graph: SYatter Plot X and y__ Analysis: I analysed the two graphs and I found that the carpet had less friction then the lab tables in our science room. The reason that the carpet didn't have a lot it had little indents in the carpet.
 * Object || Mass (g) || Weight (N) || Static Friction (N) || Sliding Friction ||
 * 1 || 102.5 || 1.025 || .45 || .4 ||
 * 2 || 227 || 2.2 || .8 || .8 ||
 * 3 || 332 || 3.3 || 1.4 || 1 ||
 * 4 || 446 || 4.4 || 1.6 || 1.4 ||
 * 5 || 577.5 || 5.7 || 1.8 || 1.6 ||