arXiv:1206.6489

Using Tracker as a Pedagogical Tool for Understanding Projectile Motion

Tracker for projectile motion

TrackerProjectile MotionKinematics

Using Tracker as a Pedagogical Tool for Understanding Projectile Motion — Projectile motion becomes clearer when x and y graphs are built from real video.

Research Digest

This paper uses Tracker to make projectile motion evidence-based. Students can separate horizontal and vertical motion from a real video, making the independence of components easier to justify.

Use It Tomorrow

Track a projectile video and compare x-time, y-time, vx-time, and vy-time graphs. Ask which graph shows constant velocity and which shows acceleration.

Pedagogical Move

Make students explain why horizontal and vertical components can be analysed separately.

Student Agency

Frame the task so students work like young scientists: they choose or justify the variable to test, make a prediction, collect evidence, defend a claim, and decide how to improve the model or investigation.

Discussion Prompts

What evidence does the model, video, or activity make visible?
Which variable should students change first, and what should they keep constant?
What claim can students make from the evidence, and what limitation should they acknowledge?

Reveal suggested answers

Evidence: Tracker makes the projectile path, horizontal and vertical position data, velocity graphs, and acceleration estimate visible from a real video.
Variable: Change the launch angle or initial speed first; keep the same video scale, frame rate, gravity, and tracking method fixed.
Claim: Students can claim that horizontal velocity is approximately constant while vertical motion accelerates downward, while acknowledging tracking uncertainty and air resistance.