Use the Time of Flight Pad to precisely measure how long a projectile has been in motion. The Time of Flight Pad is used with the Vernier Projectile Launcher and a Vernier interface to determine the launch speed of a projectile, along with the time the projectile is in flight. Time-of-flight measurements allow students to see just how kinematic calculations work in real-world applications. The Time of Flight Pad is electrically like a photogate. When a ball strikes the foam top surface, a circuit is closed.