Chapter 5: Forces in Two Dimensions

Forces in Two Dimensions:

This unit extends the discussion of Newton's laws in the previous chapter to two dimensions. The first section reviews formal vector addition in one dimension and extends it to two dimensions. The second section introduces kinetic and static friction and illustrates how to include friction in Newtonian analysis. Finally, additional two-dimensional situations are discussed, including inclined planes, as is the concept of an equilibrant.

Power Standards:

Students will be able to read and solve physics problems by writing down what is given in the problem, choosing the correct equation, and calculating the correct answer with the appropriate unit.
Students will be able to read laboratory investigations, follow the directions, use laboratory equipment properly, follow safety instructions, and analyze the data to help apply physics concepts learned.
All students will be able to explain velocity, acceleration, and forces for objects in one-dimensional motion and two-dimensional motion. Students will use graphs, free body diagrams, written expression, and laboratory investigations to apply those concepts to everyday life.

Learning Targets:

Learning targets are what the students will be assessed on.

Physics Knowledge:

PK 5.1 - I know how to solve for the vertical and horizontal components of a resultant vector, as well as solving for the resultant or equilibrant vector when given two component vectors. Chapter 5, Lesson 2
PK 5.2 - I understand the difference between kinetic and static friction and understand how the coefficient of friction relates to friction. Chapter 5, Lesson 3
PK 5.3 - I know how to resolve the gravitational force into two components and be able to explain what happens to those two components when an incline plane becomes steeper or less steep. Chapter 5, Lesson 4

Math:

M 5.4 - I can use trigonometry to solve physics problems. Chapter 5, Lesson 1
M 5.5 - I can use the five steps to solve for an unknown variable with the equations given in this chapter and previous chapters. Chapter 5, Lesson 3 and Lesson 4
M 5.6 - I know the abbreviations/units for all the previously learned terms and the coefficient of friction. Chapter 5, Lesson 3 and Lesson 4

Standards Based Grading Scale:

All of the above learning targets will be assessed with the following scale:

4 - Advanced. The learner has demonstrated a high level of conceptual and procedural understanding of the specific knowledge and skills.

3 - Proficient. The learner has demonstrated understanding of the specific knowledge and skills.

2 - Beginning. The learner is emerging but does not yet demonstrate understanding of specific knowledge and skills.

1 - The learner has provided some evidence, but not enough to assess proficiency.

0 - The learner has provided no evidence of the skill.

Learning targets will be added to MiStar at the beginning of the chapter and grades (0-4) will be entered as the students meet with the teacher and demonstrate their understanding of the learning targets. Learning target grades may not be added at the same time. If there is a blank, then the student may not have had the opportunity to demonstrate thier knowledge yet. A grade entered as zero means that they had the opportunity to demonstrate their knowledge and they chose not to.

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