Transcript Principles of Rocketry Our Water Rockets Instead of hot gases creating pressure, we use a bike pump and store pressure Action: Expelling water from.

Principles of Rocketry
Our Water Rockets
Instead
of hot gases creating pressure, we
use a bike pump and store pressure
Action: Expelling water from engine bottle.
(water is forced down)
Reaction: Water resisting against rocket
body.
(Rocket is forced up)
Water Rockets Work Like
DRAW THE ROCKET
Real Rockets
AND WRITE
EVERYTHING DOWN
Pascal’s Principle
Reaction:
Bottle forced up by
water being expelled
down
High Air pressure is
transmitted equally
in all directions and
parts of the fluid.
Action:
Water forced out
and down by air
pressure
Other factors that make the Water Bottle
Compressed Air + Water
Rocket Fly
Don’t
WRITE
This
How Newton's Laws Affect Our
Rockets
WRITE
• Newton's First Law
The pressure inside the rocket
must overcome the INERTIA of
the rocket’s weight to launch. If
the rocket has too much water, it
will have too much
weight/INERTIA.
THIS
Newton's Second Law
This is why you need just the right mass
and force to achieve a good acceleration
80psi is perfect for 275-350g
a= F
m
DON’T WRITE
WHAT’S IN
YELLOW
Newton's Third Law
• When you pull the pin, that area of High
Air Pressure in the top of your rocket
engine is going to force, throw, hurl, spew
that "massive" water out the bottom of
your rocket at a great speed. The water
and air is pushing down (action force), so
your rocket must go up (reaction force).
Stability During Flight
The orientation of fins and distribution
of mass help make the rocket stable.
Center of Pressure
DON’T
WRITE
THIS
DOWN
Center of Gravity
Stability During Flight….
Think about a dart….
Fins or feathers
in the rear act
like wind veins
and trail behind
DON’T
WRITE
THIS
DOWN
Heavy mass in front carries the
momentum
WRITE
THIS
Newton's 3 Laws Explains
Everything
Newton's 3 Laws of Motion
• #1 An object will stay at rest unless a force
acts upon it.
• #2 Force = Mass x Acceleration
• #3 For every action there is an equal and
opposite reaction.
Center of Gravity
The next drawing indicates how the fin should look once folded.
Mark straight lines on the bottle by putting the bottle in the door frame or a right angle
and trace a line on the bottle with a marker. Use these lines as guides to place the
fins on the bottles.
Title: Rocket Lab
Purpose:
Hypothesis:
Procedure:
Drawing: Rocket Design Rough Draft (label
all parts, give dimensions, shape, etc.)