This screencast, we see how the shape of a stain defines the angle of impact. In general terms the more circular the stain, the more perpendicular will be the angle at which it struck the surface. The more elliptical the shape of the stain, the more acute the angle will be. With practice and experience, the analyst can recognize the general angle of impact based solely on the shape of the stain.

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

In this learning object the student will learn how to measure a stain and calculate angles of impact. Determining the angle of impact for bloodstains takes advantage of the trigonometric functions (Sine function).

A mathematical relationship exists between the width and length of an elliptical bloodstain which allows for the calculation of the angle of the impact for the original spherical drop of blood.

Given well formed stains we can accurately measure the width and length by simply dividing the stain along it’s major and minor axis. The opposite halves would be generally equal to each other which aids in establishing the impact angle.

In this learning activity you'll discover how visual perception of size is influenced by what's surrounding an image.

Learners examine how metal detectors function. This object includes animation and sound.

The learner will understand how to use a cause and effect diagram to find the root cause of a problem.

The learner examines what it means to listen respectively and how to become a better listener.

In this learning activity we’ll learn how the web works by using a Request and Response algorithm.

This video will demonstrate angle turning with a compound rest on an engine lathe.

In this animated object, learners follow an analogy of water flowing through pipes and valves to see how resistance decreases in a parallel circuit as branches are added.

In this learning activity you'll observe how switches are used in local area networks to increase data transmission speeds.

In this learning activity you'll explore how computers connected on a network use Ethernet technology.

In this animated object, learners follow an analogy of water flowing through pipes and valves to see how current increases in a parallel circuit as branches are added.

Learners study the effect that pressure has on boiling temperatures. Once a liquid has reached a full boil, additional heat does not raise the liquid’s temperature; however, pressure can vary the boiling point of a liquid. A brief quiz completes the activity.

The learner will understand how to properly use a fillet gage to measure weld size.

Brainstorming helps find new ideas to problems. Learn how you can use brainstorming to write a paper, give a speech, or work on a group project. In this video, you’ll explore what brainstorming is and how to use it.

In this animated object, learners examine what anxiety is, how it affects people, and ways to manage it.

Learners examine how CEC, base saturation, and soil pH work with each other to define plant nutrient availability.

In this learning activity you'll discover how to evaluate a problem statement using both the MEA and the IP Techniques.

In this interactive object, learners review how to read a caliper. They then test their skills with eight practice questions.