## Reflection: Checks for Understanding Friction Is Not Fiction! - Section 4: Students Determine Coefficient of Friction

When I examine the Student Work, it is clear to me that most of the students are proficient at free body diagrams and understand how to determine the coefficient of friction. Most of my groups calculate a value in the range of 0.2-0.3 which agrees with the value I calculate on my own. There will be variation in the values because of the variations on the surface of the wood blocks. Also, students sometimes do not pull the spring scale horizontally, which results in a slighty higher force reading.

Unfortunately, several groups lose points because one of them didn't complete their role. I always give students the opportunity to redo lab activities during a free period. It is vitally important that students get to practice the skills needed to succeed in a lab and some need more chances than others to get it right.

Checks for Understanding: Student Work

# Friction Is Not Fiction!

Unit 1: Forces in One Dimension
Lesson 8 of 11

## Big Idea: The force of friction between two objects is determined by the normal force and the properties of the surfaces in contact.

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Standards:
Subject(s):
Newton's Laws, Science, Physical Science, Newton's Second Law, friction, Newton's First Law, Newton's Third Law, coefficient of friction, inertia, kinematics, Forces
50 minutes

### Jameson Parker

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