Presentation on theme: "NEWTON’S 3"— Presentation transcript
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NEWTON’S 3RD LAW
Newton's third law is: For every action, there is an equal and opposite reaction.Slide2
Ms Carruth 7th grade science
32 studentsListen, Look, Learn!Newton's 3rd lawSlide3
Problem
How can a horse pull a cart if the cart ispulling back on the horse in the oppositedirection with the same amount of force?
Aren't these balanced forces resulting in no acceleration?Slide4Slide5Slide6
In aerospace engineering, the principal of action and reaction is very important. Newton's third law explains the generation of thrust by a rocket engine. In a rocket engine, hot exhaust gas is produced through the combustion of a fuel with an oxidizer. The hot exhaust gas flows through the rocket nozzle and is accelerated to the rear of the rocket. In re-action, a thrusting force is produced on the engine mount. The thrust accelerates the rocket as described by Newton's second law of motion.Slide7
Hot gas produced by combustion of a fuel
Gas flows through rocket and accelerates to rear
Thrusting force produced
Thrust accelerates rocketSlide8
1. Carefully cut out the rectangle. This will be the body tube of the rocket. Wrap therectangle around a pencil length-wise and tape the rectangle so that it forms a tube.2. Carefully cut out the two fin units. Align the rectangle that extends between the two fins
with the end of your body tube and tape it to the body tube. Nothing should stick out past thebody tube! Do the same thing for the other fin unit, but tape it on the other side of the pencil,so you have a “fin sandwich.”3. Bend the one fin on each fin unit 90 degrees so that each fin is at a right angle to its
neighbor. When you look along the back of the rocket, the fins should form a “+” mark.
4. Using the sharpened end of your pencil, twist the top of the body tube into a nose cone.
Measure your nose cone from its base to its tip and record the length on your Data Log and on
the rocket itself
(For the Data Log, create a chart on a piece of paper with columns labeled “Rocket Length”
and “Distance Traveled.” For every attempt, fill in the log).
5. Remove the pencil and replace it with a soda straw. Blow into the straw to launch your
rocket! Record the distance it travels on your Data Log.Slide9
More materials. Make sure there is enough for all the studentsGarbage bags at each table
Designate one or two areas for testing rockets, instead of at each individuals deskSlide10
Exit TicketWhat is Newton's third law?What are three ways we use Newton's third law in everyday life?Slide11
Things to watch out for in your lessonMake sure there are no special needs children in room when conducting lesson
Make sure that you have a way to gain control over your class when neededClean upEnough materialsIf you can split up
bff’s
they make bad lab partners
