This activity focuses on phenomena of motion at changing speeds. For example: A car drives slowly at first, then gradually increases its speed. We say that the car is accelerating. A car gradually decreases its speed (and perhaps comes to a halt). We say that the car is decelerating. trace 2 1 You can use the From steps to motion tool to construct descriptions of motions at changing speeds in various representations: measure of change, time-position graph, and motion simulation. Study motion at changing speeds in various representations Describe various types of motion of a ball that can be generated with the From steps to motion tool. Use words, numbers, and symbolic expressions to describe in different ways the speed and distance travelled. Describe examples of: - motion at constant speed - accelerating motion - decelerating motion Use the mouse to translate the graph up and down. How are these translations expressed in descriptions of the ball's position and of its speed? The tasks in this activity present various phenomena of acceleration and deceleration. Analyze these phenomena using the available simulation tools and various mathematical representations (value tables, graphs, correspondence rules). In addition to the From steps to motion tool, you can use the Constant acceleration and From correspondence rule to motion tools. The Motion in steps tool can help you construct value tables.

From steps to motion Constant acceleration From correspondence rules to motion Motion in steps Various ways to describe motion Average velocity Constant acceleration Runway Car performance Stopping a train Stopping a car Speed and stopping distance Dangerous speed Speed limits Truck speeds Accident investigation Accelerating and decelerating