In this interactive object, the learner views examples of the neutral position of the back and compares that stance to the flat back and swayback positions. A brief quiz completes the activity.

In this animated object, learners examine a closed-loop feedback system that uses digital circuits to control the position of a gear rack.

In this animated object, learners examine an analog closed-loop feedback system that uses potentiometers to control the position of a gear rack.

In this interactive learning activity, learners review the terms used to describe relative position of body parts in order to have a common set of words to describe their position.

Practice Directional Terms

Students read an explanation of "superposition" as a technique for ac circuit analysis. Complex numbers are used.

Learners read the definitions of the prepositions "in," "on," and "at" and view examples of how these words are used. They then complete an exercise by inserting the prepositions into sentences.

The superposition theorem is explained as it relates to dc circuit analysis. Examples are given.

The learner will recognize standard-position angles and find the reference angle for any standard-position angle.

Students match 12 examples with the terms

Students match 15 terms with the examples

In this interactive object, students view the various positions used during medical examinations. They then match the names of the positions with the correct images and with their descriptions.

You'll find the standard-position angle for a given reference angle.

Learners examine the method for calculating the atomic weight of copper from the natural percent composition of each of its two isotopes.

Hit the right term: Areas and positions of the human body

Definitions and examples of each term

Learners examine the method used to calculate the mass percent of an element in a compound. Three examples and one problem illustrate the method.

In this animated object, learners examine the situation that occurs when any two links of a mechanism lie in the same plane or on a straight line. Crank-sliders and crank-rockers are shown.

Students identify the various regions of the human body through video.

In this interactive object, learners examine standard and metric thread specifications used in engineering drawings. In a brief quiz, they identify various internal and external thread representations.