Newton's Third Law of Motion

Third Law - to every action force, there is an equal and opposite reaction What will happen if one of the passengers jumps out of the boat? Newton”s 3rd Law.  Watch it!

Action - Reaction The “KICK” of a firearm is called RECOIL When a pistol fires, the bullet exits with force, the opposite reaction is to move toward the person firing the gun. The “KICK” of a firearm is called RECOIL  

Video on Propulsion What are the forces acting on the jet?

You can create something similar to a jet using a straw and a balloon. A.  Attach balloon to the straw with masking tape B. Attach a second straw vertical to the first one using a pin. C. Blow up the balloon and then release it. 1.  What happens to the straw as the air goes out of the balloon? ________ 2.  If you bend the straw to the right, the straw spins which direction?   ______ 3.  If you bend the straw to the left, the straw spins which direction?  _______ 4.  What can you do to SLOW the spin of the straw? _________________

Balloon Car You can build a balloon car with index cards, straws and other assorted objects.   Which of the following would make it go faster? (check) ___ Bigger wheels ___ Bigger balloon ___ Bigger straw ___ Bigger body ___ Raise balloon higher When air is released from the balloon, which direction does the car travel?

MOMENTUM = mass x velocity p = mv Momentum describes how much force is necessary to change its motion Which has more momentum: soccer ball traveling at 5 m/s   or  a train traveling at 5 m/s

 p = mv 1. What is the momentum of a car with a mass of 1000 kg traveling at the speed of 2 m/s? 2.  A baseball has a momentum of 6 kg*m/s.  If the mass of the baseball is 3 kg, what is the baseball's velocity? 3.  What is the mass of a person walking at a speed of 2 m/s if the person's momentum is 50 kg*m/s

Law of Conservation of Momentum states that the total momentum of an isolated system before collision is always equal to total momentum after collision *If you hit a pool ball into another pool ball, momentum is transferred and *conserved*.  The cue ball stops but the other ball moves.

Where would you need to hit the cue ball? Objects in motion tend to _________ in motion. Force equals ___________ x acceleration

COLLISIONS Elastic vs inelastic Elastic - objects bounce off each other Inelastic - objects stick together Conservation of Momentum still applies. Experiments with the airtrack.

QUIZ TIME - Newton's 3rd Law

1.  When looking at the forces on a jet, what force counteracts gravity? 2.  Newton's Third Law states that for every action there is an opposite __________________ 3.  If you jump off the back of a boat, the boat will move in which direction? 4.  What is the equation for momentum? 5.  Momentum describes how much force is necessary to ________________________

6. The Law of ____________________ of momentum states that the total momentum of an isolated system before collision is always equal to total momentum after collision 7. Which of the following situations best illustrates this Law? a) a large ball is used to knock a smaller ball off a table b) a cannonball is launched from a cannon c) a rocket is propelled upward when the engine fires 8. Which has more momentum? a) 5 kg toy car traveling at 3 m/s b) 5 kg toy traveling at 6 m/s 9. In an elastic collision, objects will _____________ 10. Who developed the Laws of Motion? ___________