Ask the question: What would happen when a car suddenly brakes on an icy road? On a normal road?
Give students books, string, and a force gauge and ask students to figure out the easiest way to move the books across the table. Also give them material on which they can pull the books on. i.e. cloth, colored pencils, sandpaper. Have them find out which takes the smallest amount of force and which one takes the largest amount of force.
Tell the students about different types of friction. Define static and kinetic friction. Define sliding and rolling friction. Have a book on each table of students. Have them demonstrate each friction..
Static – book not moving
Kinetic – book moving
Sliding – dragging book on table
Rolling – dragging book on top of colored pencils
Explain how to measure friction with the force gauge. Give each group a force gauge and 3 text books. Students are write down each measurement in an excel sheet. Template provided below.
|1 book||Trial 1|
|2 book||Trial 1|
|3 book||Trial 1|
Remind students to input the data into an excel spreadsheet and make graphs of the data. Template provided above. Show students how to create graphs in excel.
- Input data and then go to insert
- Choose the type of chart/graph to create
Students are to interpret the data using graphs and explain any patterns they see. Explain how the data can be utilized for practical uses.
Key Standards Supported
Motion and Stability: Forces and Interactions
Analyze data to support the claim that Newton’s second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration.