1. Atwood machine

Length: 1.5 m
Pulley: Wheel mounted on low resistance free rolling bearing
Number of sensors: 2  
Position adjustment for sensor: Yes
Levelling screw for base: Yes

2. Time interval clock

Range: 0-999.9 sec
Resolution: 0.1 sec
Time measuring: Based on inputs from start sensor and stop sensor
Reset: Automatically on interrupting start sensor
Rated Input: 220 V/50 Hz or 110 V/60 Hz
Power consumption: <50 W

3. Electromagnet & weights

Electromagnet for release of weights from still
Balancing weights: Slotted weights tied end-to-end, pair of 5x50 g