Mg-4 Weightlessness


To demonstrate weightlessness of a free-falling body using an accelerometer.


  • Accelerometer
  • High Speed Video Camera i-Speed 221
  • Laptop Computer
  • Cushion

Accelerometer 1 Accelerometer 2



When an accelerometer is held in the vertical position by hand approximately 1m above ground, the LEDs will indicate that the accelerometer is experiencing an upwards force. That is a contact force from your hand preventing the accelerometer from falling towards ground. When the accelerometer is released will experience no contact forces and will be in a state of weightlessness until it strikes the cushion on the ground. This is confirmed with no LEDs indicating an upward or downward force. The use of slow-motion replay will confirm this. It takes the accelerometer about 0.4s to strike the cushion.