- Physical Science - Position and motion of objects
- Science and Technology - Abilities of technological design -
Understanding about science and technology
Science Process Skills:
- Making Models
- To demonstrate how rocket liftoff is an application of Newton's
Laws of Motion.
Students construct a rocket powered by the pressure generated from
an effervescing antacid tablet reacting with water.
For best results, students should work in pairs. It will take approximately
40 to 45 minutes to complete the activity. Make samples of rockets
in various stages of completion available for students to study. This
will help some students visualize the construction steps.
A single sheet of paper is sufficient to make a rocket. Be sure
to tell the students to plan how they are going to use the paper.
Let the students decide whether to cut the paper the short or long
direction to make the body tube of the rocket. This will lead to
rockets of different lengths for flight comparison.
The most common mistakes in constructing the rocket are: forgetting
to tape the film canister to the rocket body, failing to mount the
canister with the lid end down, and not extending the canister far
enough from the paper tube to make snapping the lid easy. Some students
may have difficulty in forming the cone. To make a cone, cut out
a "Pacman" shape from a circle and curl it into a cone. See the
pattern on the next page. Cones can be any size.
Film canisters are available from camera shops and stores where
photographic processing takes place. These businesses recycle the
canisters and are often willing to donate them for educational use.
Be sure to obtain canisters with the internal sealing lid. These
are usually translucent canisters. Canisters with the external lid
(lid that wraps around the canister rim) will not work. These are
usually opaque canisters.
This activity is a simple but exciting demonstration of Newton's Laws
of Motion. The rocket lifts off because it is acted upon by an unbalanced
force (First Law). This is the force produced when the lid blows off
by the gas formed in the canister. The rocket travels upward with
a force that is equal and opposite to the downward force propelling
the water, gas, and lid (Third Law). The amount of force is directly
proportional to the mass of water and gas expelled from the canister
and how fast it accelerates (Second Law). For a more complete discussion
of Newton's Laws of Motion, see
Materials and Tools:
*The film canister must have an internal-sealing
lid. See management section for more details.
- Heavy paper (60-110 index stock or construction paper)
- Plastic 35 mm film canister*
- Student sheets:
- Cellophane tape
- Effervescing antacid tablet
- Paper towels
- Eye protection
Refer to the Student Sheet.
- How does the amount of water placed in the cylinder affect how
high the rocket will fly?
- How does the temperature of the water affect how high the rocket
- How does the amount of the tablet used affect how high the rocket
- How does the length or empty weight of the rocket affect how
high the rocket will fly?
- How would it be possible to create a two-stage rocket?
Ask students to explain how Newton's Laws of Motion apply to this
rocket. Compare the rockets for skill in construction. Rockets that
use excessive paper and tape are likely to be less efficient fliers
because they carry additional weight.
- Hold an altitude contest to see which rockets fly the highest.
Launch the rockets near a wall in a room with a high ceiling.
Tape a tape measure to the wall. Stand back and observe how high
the rockets travel upward along the wall. Let all students take
turns measuring rocket altitudes
- What geometric shapes are present in a rocket?
- Use the discussion questions to design experiments with the
rockets. Graph your results.