2 Our Water RocketsInstead of hot gases creating pressure, we use a bike pump and store pressureAction: Expelling water from engine bottle.(water is forced down)Reaction: Water resisting against rocket body.(Rocket is forced up)
3 DRAW THE ROCKET AND WRITE EVERYTHING DOWN Water Rockets Work Like Real RocketsDRAW THE ROCKET AND WRITE EVERYTHING DOWNPascal’s PrincipleReaction:Bottle forced up by water being expelled downHigh Air pressure is transmitted equally in all directions and parts of the fluid.Action:Water forced out and down by air pressure
4 Other factors that make the Water Bottle Rocket Fly Compressed Air + WaterDon’t WRITE This
5 How Newton's Laws Affect Our Rockets WRITE THISNewton's First LawThe 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.
6 a = F m Newton's Second Law This is why you need just the right mass and force to achieve a good acceleration80psi is perfect for ga=Fm
7 DON’T WRITE WHAT’S IN YELLOW Newton's Third LawWhen 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).
8 Stability During Flight The orientation of fins and distribution of mass help make the rocket stable.Center of PressureCenter of GravityDON’T WRITE THIS DOWN
9 Stability During Flight…. Think about a dart….DON’T WRITE THIS DOWNFins or feathers in the rear act like wind veins and trail behindHeavy mass in front carries the momentum
10 Newton's 3 Laws Explains Everything WRITE THISNewton'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.
13 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.