## Reflection: Modeling 1-Dimensional Motion Review - Section 4: Review for Unit Test - Teacher

In my mind, the purpose of modeling solutions to problems is to show students how I go through and solve problems (quantitatively or qualitatively).  I describe my entire thought process as I'm going through and solving a problem.  Here's my "script" for problem 2 from the practice test:

"All of the following are vectors, except: mass, acceleration, displacement, velocity, or force. When I look at the question, the first thing I think about is 'What is a vector?'" I write the first definition of vector on the board and underline the words magnitude and direction.  "So, now that I'm sure what a vector is, I know that anything in my list that has an amount and a direction is NOT the answer. Hmmmmm, mass has an amount but no direction, so that's a possible choice.  Acceleration has an amount and direction, so that's not it.  Displacement has an amount and direction, so that's not it either.  Velocity depends on displacement, so it can't be velocity.  And force, well, we're not familiar with that yet, but I know good old Newton's Second Law says that F=ma, so if it depends on acceleration then force must be a vector. That means that mass is the only choice that satisfies our question, so 'A' must be the answer."

What Modeling Solutions Means To Me...
Modeling: What Modeling Solutions Means To Me...

# 1-Dimensional Motion Review

Unit 1: 1-D Kinematics
Lesson 8 of 9

## Big Idea: Who does a student need to solve 1-D kinematic problems? Today students work alone, with a partner, and then with the teacher to complete a practice test.

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50 minutes

### Sara Leins

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