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## Distance-Time Graphs

This is a*representation*reviewed for the following learning goal:

An objectâ€™s position and motion can be represented on a graph.

## Summary

The narrated, animated slide show describes a distance-time graph and explains what the slope of a distance time graph represents and its usefulness in understanding an object's motion. It includes an interactive test and review of the material. It addresses the key idea that an object’s position and motion can be represented on a graph. It is *likely to be comprehensible *to middle school students. The slide describing the calculation of slope for position-time graphs includes calculations that may be above the expected level of sophistication for middle school students.

Limitations:

**De-emphasize the calculations of slope and emphasize the qualitative differences between steeper and shallower lines on these graphs.**

Suggestions to improve effectiveness:Suggestions to improve effectiveness:

## Detailed Review

### Description

The representation is an animated slide show which:

-describes a distance-time graph

-explains what the slope of a distance time graph represents

-explains its usefulness in understanding an objects motion

This resource also includes an interactive test and review of the material, and can be downloaded for offline use.

**Resource Copyright Owner:**2004 Intel Corporation**Type of Resource:**application/x-shockwave-flash

## Content alignment

The resource addresses the actual substance of the learning goal rather than just the topic.

### Explanation

This resource explains how an cyclist's position, motion and speed can be measured and represented on a graph.

## Scope

The resource addresses the entire learning goal.

### Explanation

An objectâ€™s position and motion can be represented on a graph.

## Sophistication

The resource correctly reflects the level of sophistication of the learning goal.

### Explanation

The level of sophistication of this resource is appropriate for middle school students. The slide describing the calculation of slope for position-time graphs includes calculations that may be above the expected level of sophistication for middle school students.

## Notes for Teachers

De-emphasize the calculations of slope shown within the slide show, instead emphasizing the qualitative differences between steeper and shallower lines on these graphs.

## Quality of instructional support

**Does the representation accurately represent relevant aspects of the learning goal and/or brings out limitations that are not accurate?**

Yes—The representation accurately represents relevant aspects of the learning goal and brings out inaccuracies, if there are any.

This resource accurately describes how a distance time graph represents the position, direction of motion and speed of an object. It does show (and explain) how a difference in slope represents a difference in speed.

**Is the representation likely to be comprehensible to students? **

Yes—The representation is likely to make the learning goal comprehensible to students.

There are no inaccuracies that would hinder a students comprehensibility of this resource.

**Does the representation make clear which aspects of the real thing are represented and which are not?**

Yes—The representation makes clear which aspects of the real thing are represented and which are not.

The graphs are accurately drawn and the drawings are accurate representations of the actual objects being discussed.

## Summary Judgment

Useful

## Notes to teachers

This resource presents a fairly basic, direct instruction approach to the learning goal. Teachers may wish to use this resource as a review of the topic or supplement it with in-class experiences graphing objects moving at a constant velocity.