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Direct Measurement Video Analysis: Friction of a Block Sliding Down a Ramp

by Jenna Ginsbach

Summary

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This activity is intended for an entry level algebra-based physics course in the chapter of forces in two directions. The objective of this lesson is for students to use a direct measurement video to calculate the coefficient of kinetic friction of a block sliding down a ramp. This video is best used after the students have a good grasp of forces in two directions, and the students must have prior experience with direct measurement videos.

Learning Goals

The objective of this lesson is for students to use a direct measurement video of a wooden block sliding down a ramp to calculate the coefficient of friction between the ramp and the block. To do this, students will have to apply what they have learned in class about forces and motion, vectors, and friction. Specifically, students will:

Context for Use

I would use this activity after students have learned about forces in two directions in an introductory, algebra-based physics course. This activity could be used after the lesson is taught to practice and reinforce the ideas that were just taught. If used right after the lesson, scaffolding may be required if the students have not yet mastered the concept. This activity could also be used a few days after learning about forces in two directions with little to no guidance to allow the students to show their mastery on the topic.

If a classroom set of laptops is available, each student can download this video and work on the activity individually for 10-15 min. Alternatively, they class could view the video together, projected on an screen in front of the class. Through classroom discourse, consensus can be reached on what measurements will be needed to complete the analysis. Next, I would either let them continue on their own or I would let them pair up to work with a partner for the remainder of the time. Depending on the student's exposure and practice to forces in two directions, this lesson make take 30 minutes up to 60 minutes. I would consider this activity more lab based because the students are working on their own or in groups and using discovery learning.

Note: This activity is being used with the assumption that this is not the first time the students have ever worked with a Direct Measurement Video.

Description and Teaching Materials

I would do this activity with my students after learning about forces in two directions. If my students have a very good grasp on the topic I would use the worksheet that is title "Little Guidance." This worksheet does not guide the students step-by-step, and really demands a lot of critical thinking done by the students. If my students did not have a very good understanding, I would use the worksheet that has the title "Scaffolding." This worksheet has a step-by-step process that walks them through the whole entire worksheet of finding the coefficient of kinetic friction. This worksheet does not demand a lot of independent critical thinking.

Description of the mechanics of this activity: See worksheet(s)

Block Sliding Down a Ramp Video Page contains video files in several formats.

Block Sliding Down a Ramp Scaffolding with Answers (Microsoft Word 2007 (.docx) 237kB Jul13 12)

Block Sliding Down a Ramp Scaffolding with NO Answers (Microsoft Word 2007 (.docx) 75kB Jul13 12)

Block Sliding Down a Ramp with Little Guidance with Answers (Microsoft Word 2007 (.docx) 210kB Jul13 12)

Block Sliding Down a Ramp with Little Guidance with NO Answers (Microsoft Word 2007 (.docx) 72kB Jul13 12)

Teaching Notes and Tips

Assessment

This activity is to be used after students have learned forces in two directions. After the students have successfully completed this activity, I will follow up with some end of the chapter problems to measure the degree of learning. After the problem set is completed, I will then follow up with a Chapter Test Assessment.

References and Resources


The Block sliding down ramp video page contains video files in several formats.

Students can access this video via the student video library which allows access to all videos for students, without links to instructor materials.