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A mass hanging from a scale shows the force exerted on the mass by gravity. This can be demonstrated with a spring scale or Pasco Force Sensor (which can be displayed on screen).

Sping Scale with 1Kg massSping Scale with two 1Kg masses

 

Digital Force Sensor with 1Kg massDigital Force Sensor with two 1Kg masses

Using two 1 Kg masses hanging from the scale, an interesting addition is to ask the students what would the scale read if the masses were hung from either end of the scale (would the scale read 0, 10, or 20 Newtons?)

Spring scale two 1Kg masses hung from each endSpring scale two 1Kg masses hung from each end - Scale reading

This can also be done with the digital force sensor. 

1Kg masses hanging from each side of the force sensor