10 Friction TN.doc - Activity 10 Teacher Notes Static and Kinetic Friction PS-2826B Teacher Notes – Activity 10 Static and Kinetic Friction Time

10 Friction TN.doc - Activity 10 Teacher Notes Static and...

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Activity 10 Teacher Notes: Static and Kinetic Friction PS-2826B Teacher Notes – Activity 10: Static and Kinetic Friction Time Estimates Preparation: 20 min Activity: 30 min Objectives Students will be able to… use a Force Sensor to measure the force of static and kinetic friction for different materials. use the Xplorer GLX to record and display the force from the sensor. use the graph of force versus time and the built-in analysis tools of the Xplorer GLX to determine the maximum force of friction (static friction) and the force of kinetic (sliding) friction (average force during sliding). calculate the normal force and the coefficients of static and kinetic friction for the different materials. Notes An alternative to sliding the Force Sensor along the top of the track is to place a block under the sensor so that the string between the sensor and the friction tray is parallel to the track. (The ME-9807 IDS Friction Block is the right height for this.) A coefficient of friction is specific to a combination of surfaces. For example, the coefficient of static friction for wood-on-wood is 0.5 and the coefficient of kinetic friction is 0.3. However, for rubber on dry concrete, s is 1.0 and k is 0.7. On the other hand, for shoes on ice, s is 0.1 and k is 0.05.

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