We present four experiments (spring, pendulum, free fall, and parabolic throw) for measuring the acceleration due to gravity g, using a computer sound card. In each case, a device is connected to the audio input and an audio editing software  is used for recording the electric signal generated by the device. This method allows time measurements with an accuracy of about 10-4 s.
- In the mass-spring system , the signal comes from the electric current generated in a coil by a magnet attached to the mass hanger.
- In the pendulum case , the signal comes from an optocoupler that detects the motion of the thread.
- In the free fall case , the signal comes from the electric current generated by the passage of a small magnet through three coils located at different heights in a vertical methacrylate tube.
- In the parabolic throw case , the signal comes from the sound generated by a steel ball, stroked by another ball, from a known height.
These experiments are enriched with other physical phenomena that contribute to learning with the support of new technologies.