## Trajectory - Horizontally Launched Projectiles

The Trajectory - Horizontally Launched Projectiles Concept Builder is comprised of five problem. Each problem has three parts - the selection of a motion diagram with x- and y-velocity vectors, the calculation of the x- and y-velocity values at 1-second intervals, and the calculation of the x- and y-positions at 1-second intervals of time. The five problems are identical with the exception of the launch velocity value. Students will not have to complete all five problems if they exhibit an understanding of the analysis. A Health bar is used to report student comfort with the task. Students who exhibit a high level of comfort will receive the completion award after solving two of the five problems.

Teachers are encouraged to either do the activity or view the questions (below) to make a judgement about the suitability of the activity for their classes.

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### Trajectory: Horizontally Launched Projectiles

There are five questions in this Concept Builder. They differ only in terms of the initial launch velocity. The velocity values are 12.0 m/s, 14.0 m/s, 15.0 m/s, 16.0 m/s, and 18.0 m/s.

A projectile is launched horizontally from a cliff top. Select the corresponding motion diagram.

Choose from among the following choices.

A projectile is launched horizontally from a cliff top at 12.0 m/s. Determine the values of the velocity components at 1-second intervals of time.

A projectile is launched horizontally from a cliff top at 12.0 m/s. Determine the x-y positions at 1-second intervals. The launch position is (0 m, 0 m).