SpeedGate is a dual beam photocell with a built-in display. With two light rays it is possible to directly measure the velocity of an object passing the photocell. The display renders an external counter dispensable.
In addition to the two light beams, external signals can be used to start and stop timing. This makes it possible to measure for instance the time interval between the passage of two photocells.
The inputs can also be used completely without the light beams. This way, SpeedGate can be used for universal timing, e.g. with two microphones.
Newton's second law
Collisions on an air track
Mathematical pendulum with SpeedGate
Circular motion with conical pendulum
Conical pendulum - measuring g
The Bessel pendulum
Speed of sound in air with SpeedGate