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ACTIVITIES


MAKING A BASIC TWO BOTTLE ROCKET  


For one rocket you will need: •  bottles


• A tennis ball •  • ‘Duct’ tape


  


Instructions:


1 2


Push bottom of  cut bottle.


Tape two bottles together.


8


5 6


  


Stick half width of the tape 


Attach the other half 


so it extend beyond the rocket’s bottom by at least   create drag which keeps the rocket on course.)


FORCES ON THE ROCKET


So water rockets are fun but it is also a great opportunity to talk about some science with kids.


3 4


Tape ball to the bottom of cut bottle. This pushes the rocket’s center of mass forward.


Use plenty of tape to secure the ball.


• Friction holds rocket in place and initially slows it


• Thrust from water and air leaving the rocket


•Weight is the force on the 


• Air resistance (drag) opposing rocket, proportional to speed squared


This text is taken from the NPL website and their poster on water rockets. It is worth taking a look 


Drag Friction Thrust 7


Attach the remaining two  rocket base and protruding by the same amount. (You can test this by making sure it stands 


  to secure everything in place 


 water, the magic amount of water 


Weight 29


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