Lesson+Plan

=Lesson Plan= Check out my Physics Lesson plan on Friction. Click on the Microsoft Word symbol.

** Lesson Plan **
Campus: || State Standards A.8.6 Use models and explanations to predict actions and events in the natural world
 * Title of Lesson: Frictional Force ||  Date: 6-5-09 Timeframe of Lesson: 1hr. 45min.  ||
 * Author(s): Jim Farrell ||  School District: Wabeno Elementary School
 * Subject Area(s): Physical Science ||  Grade Level(s)/Course: 6th Grade  ||

C.8.6 State what they have learned from investigations*, relating their inferences* to scientific knowledge and to data they have collected

D.8.5 While conducting investigations, explain the motion of objects by describing the forces acting on them ||||  Subject Specific: // Technology Specific //// : //  [] Or the info.pdf file in the Lesson Folder. ||   ||||  Friction is a force that resists motion. It involves objects in contact with each other, and can be either useful or harmful. Friction helps when you want to slow or stop a bicycle, but it is harmful when it causes wear on the parts of a machine. In this activity, you will study the effects of surface smoothness and the nature of materials in contact on sliding friction. You will use a computer-interfaced Force Sensor to measure frictional force, in Newtons (N), as you pull a block across different surfaces. In this experiment, you will - Use a computer to measure sliding friction. - Measure friction between a wooden block and a smooth-surface wood - Measure friction between a wooden block and a rough-surface wood. - Make predictions about surfaces. - Test your predictions. || |||| **  Part I: Smooth and Rough Surfaces  ** 1. Get a wooden block (with a hook on one end). Partly straighten a paper clip—leaving a hook at each end. Use the paper clip to attach the wooden block to a Force Sensor. 2. Prepare the Force Sensor for data collection. a. Connect the Dual-Range Force Sensor to the computer interface b. Set the switch to the lowest setting. c. Prepare the computer for data collection by opening the file **“19 Frictional Force”** from the Physical Science/Computers folder. 3. Slowly pull the wooden block across a piece of wood with a smooth surface. Hold the Force Sensor by its handle and pull it to you, as demonstrated by your teacher. The Force Sensor should be held parallel to and about 2cm above the surface. Once the wooden block is moving at a steady rate, click “Collect” to begin data collection. 4. After the date have collected, look at the graph displayed on the screen. If the graph is reasonably flat, proceed to step 5. If there are big peaks and valleys, repeat Step 3. 5. Click the statistics button, Record the Mean (average) force (in N). 6. Repeat Step3-5 as you pull the block over a piece of wood with a rough surface. Surface Smooth Wood Rough Wood Force (N) _ _ 7. You will measure friction as the block is pulled across your desk top, the floor, and sandpaper. Predict the order of friction for these surfaces—from lowest to highest. <span style="font-size: 9pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">8. Repeat Steps 3-5 for each of the surfaces. Predicted order of friction values for the desk top, the floor, and sandpaper. _ _ _ (lowest) (highest) Surface Desk top The floor Sandpaper Force (N)  _ || ||||  Processing the Data <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">1. What is the effect of surface roughness on friction? <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">2. How did you decide the order of your predictions in Part II? <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">3. How good were your predictions? Explain. <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">4. Give two examples of situations where friction is helpul. <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">5. Give two examples of situations where it is best to reduce friction. <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">6. Summarize the results of your experiment. || |||| <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">-  Test the friction of other surfaces, such as glass, metals, rubber, and different fabrics. <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Investigate how frictional force varies with contact area and mass <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Design an experiment to test methods of reducing friction. || <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Vernier Computer interface <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Logger Pro <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Vernier Force Sensor <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Wooden block (with a hook) <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Paper clip <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Wood with smooth surface <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Wood with rough surface <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">- Sandpaper || **__ Other Resources __**** : **// Book Titles, Art Supplies, Manipulatives, etc…. //   ||
 * Stated Objective(s)
 * Procedures for Lesson
 * Data **
 * Part II: Predicting Friction **
 * Data **
 * Assessment or Evaluation
 * Enrichment
 * Materials |||| <span style="font-size: 7pt; mso-fareast-font-family: Gourmand; mso-bidi-font-family: Gourmand; msofareastfontfamily: Gourmand; msobidifontfamily: Gourmand; msolist: Ignore;">-  Computer
 * |||| **__ Technology Resources __**** : **// URLs, Software, # of Computers, Printers, etc… //