# Quizzes & Surveys – Engineering Dynamics

If you are enrolled in MEE 211 at NIU, here is where you access quizzes that assess your understanding of concepts and assignments. To take a quiz, you will need to be logged in to this website.

#### Mastery Quiz: Vector Addition & Subtraction

Prerequisite: None.

To understand engineering dynamics, you will need to perform vector operations with fluidity. A review of vector addition and subtraction is provided here and an example problem is provided here. When you are ready, you may take the mastery quiz by clicking on the link above.

#### Mastery Quiz: Vector Decomposition, Part A

Prerequisite: Vector Addition & Subtraction

Another skill that we often use in solving dynamics problems is vector decomposition. I know you saw it and used it in your statics class. In my experience, however, many students are a little rusty. It is important that you become skilled at decomposition. A review is provided here, and example problems are provided here. Problems on this quiz are similar to the first three example problems.

#### Mastery Quiz: Vector Decomposition, Part B

Prerequisite: Vector Decomposition, Part A

Here are a few more vector decompositon problems. They’re similar to problems 4 and 5 of the examples provided here.

#### Mastery Quiz: Elementary Calculus, Part A

Prerequisite: Vector Decomposition, Part A

In dynamics, things are moving. They have position, velocity, and acceleration. These quantities are related to each other by derivatives and integrals. Here, I show you graphs of various functions, and you tell me what graphs of integrals and derivatives of that function look like. You might want to review these principles here.

#### Quiz: The Work – Energy Principle

Understanding the conditions for which forces produce positive, negative, and zero work is critical to understand how to properly use the Work-Energy Principle. In this quiz, I show you pictures of mechanical systems and ask you whether forces depicted in the pictures are producing positive, negative or zero work.

#### Quiz: Checking Units

All quantities in mechanics have units of mass, length, time, or some combination of these. As we work through dynamics problems, it is important to keep track of units and check for consistency. The ability to detect inconsistent units will allow you to find mistakes in your work.

#### Quiz: Central Impact

When two objects collide, the resulting behavior depends on the relative masses of the objects and the “springyness” of the impact. In this quiz, you are to determine these parameters based on the dynamic behavior. Before taking the quiz, you may want to look at some very similar example problems.