This document provides instructions for building and launching a basic water rocket. It explains that a water rocket is made from a 2-liter soda bottle with a nose cone and fins added. When the bottle is pressurized and launched, Newton's second law causes the expelled water to provide upward thrust, propelling the rocket. Tips are given to increase height and stability, such as using less weight and more pressurized water. The document also shares facts like the world record height of 2723 feet and how water rockets work by pressurizing the bottle space and expelling water instantly.

1. WATER
ROCKET

2. WATER ROCKET
Simply it’s an upside
down fizzy drinks
bottle, which has a
nose cone and some
fins.

3. Principle
The Newton’s Second law.
𝐹 =
𝑑𝑃
𝑑𝑡
, P=mv
For Variable Mass,
F=v
𝑑𝑚
𝑑𝑡

5. LAUNCHE
R
The main work of the
launcher is to
pressurize the empty
space
above the water.
Launch

6. Launch
Ramps

7. FUN FACTS
The Guinness world record for largest height is
2723 feet( 830 m) by University of Cape Town.
The pressure inside the bottle can reach up to
100psi - 125psi.
Water expelles out of the bottle instantly.

8. HOW TO CREATE A BASIC WATER
ROCKET
1. A two - Litre fizzy drink bottle is used to make
main body.
2. Some weight to make the nose.
3. Cardboard or plastic to make fins.
4. Strong sticky tape.

9. STABILITY
Center of mass of the water rocket
must be ahead of the center of
pressure.
CM must be nearer to the nose
and CP to the bottom.

10. 1. 𝐿𝑖𝑔ℎ𝑡𝑒𝑟 𝑡ℎ𝑒 𝑤𝑒𝑖𝑔ℎ𝑡, 𝑚𝑜𝑟𝑒 𝑤𝑖𝑙𝑙 𝑏𝑒 𝑡ℎ𝑒 𝑎𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛.
𝐹
𝑚
= 𝑎.
2. Greater the mass of the fluid expelled, greater will be the
up thrust.
3. More the pressure inside the bottle,
more will be the up thrust.
TIPS TO INCREASE THE
HEIGHT

11. AIR
DRAG
Methods to reduce Air Drag:
The fins should be thin and tapered.
Swept back fins create less drag than straight fins.
Rounded corners on a fin create less drag than sharp
corners.
Every surface should be smooth.
 Air drag is the friction force acting between the moving
rocket and the air.
 It increases with increasing velocity.

12. NOSE CONE AND
FINS
Reduces Air Drag.
Increases stability.

13. THANKS