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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