Your Own Flight
Falling through Water

Teachers' notes

Here are two ways of studying drag in the laboratory. You will need steel ball bearings of different sizes. You could also try glass marbles. 

Method 1 

  • Drop ball bearings of different sizes into a tall glass cylinder of water. 
  • Race them, or time them as they fall. 
  • Modify them with modelling clay to alter the drag on them. 
Method 2 
  • Place a gently-sloping ramp in a sink full of water. 
  • Release ball bearings so that they roll down the slope. 
  • Race them or time them. 
Use magnets to hold steel ball bearings before you release them, or to rescue the ball bearings from the water. 


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