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Monday December 12, 2011

Monday December 12, 2011. Warm Up Projectile motion describes the curved path all objects follow on the surface of Earth that results from vertical and horizontal acceleration

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Monday December 12, 2011

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  1. Monday December 12, 2011 • Warm Up • Projectile motion describes • the curved path all objects follow on the surface of Earth that results from vertical and horizontal acceleration • b. the straight path all objects follow on the surface of Earth that results from vertical and horizontal acceleration • c. the curved path all objects follow on the surface of Earth that results from vertical acceleration only • d. the curved path all objects follow on the surface of Earth that results from horizontal acceleration only Classwork #57 Momentum Notes #58 Momentum Calculations Homework Complete #56 Test: Friday

  2. #57 Momentum Notes • Momentum – a mass with a velocity. Basically any moving mass. • The more mass the more momentum • The more velocity the more momentum • Objects with a lot of momentum require a larger unbalanced force to stop them

  3. The Law of Conservation of Momentum – when objects collide the total amount of momentum stays the same • EX: a cue ball shot at an 8 ball, the momentum of the cue ball is transferred directly to the 8 ball. • EX2: Newton’s Cradle • When objects stick together - they move as one in the direction of the object with a larger momentum • When objects bounce off each other - momentum is transferred from one object to another • Newton’s 3rd Law explains momentum • Swinging a bat has a lot of momentum, once it hits the baseball the momentum is transferred to the baseball sending it away with an equal momentum • Swinging bat is the action force, the ball hitting the bat is the reaction force

  4. Calculating Momentum • Calculating Momentum • p = m ● v m = mass v = velocity • What is the momentum of a 50 kg boulder rolling 10 m/s south toward you? p = 50 kg ● 10 m/s p = 500 kg ●m/s south You TRY: What is the momentum of an ostrich with a mass of 120 kg running with a velocity of 16 m/s north?

  5. Momentum PracticeShow your work, answer in complete sentences • A 100 Kg tiger is running with a velocity of 30 m/s east. What is its momentum? • A 200 kg wildebeest is running with a velocity of 20 m/s east. What is its momentum? • What do you predict will happen when the two animals collide? • A car and a train are traveling the same velocity, do they have the same momentum? Explain. • Which of the following has the smallest amount of momentum? • A loaded 18-wheeler driving 50 m/s • An car driving 50 m/s • An empty 18-wheeler driving 50 m/s • A loaded car driving 50 m/s • When a car is hit from behind, it sometimes will also hit the car in front of it. Why does this happen?

  6. Tuesday December 13, 2011 Warm Up Classwork #57 Conservation of Momentum picture analysis #58 Conservation of Momentum paragraph Homework Complete # 58

  7. Conservation of Momentum Paragraph • http://www.flickr.com/photos/physicsclassroom/galleries/72157625280491634/#photo_5168222102 • Look at the 15 pictures on the webpage, and read the descriptions associated with each picture • Answer the questions for each picture • Why do the boys in picture 1 represent momentum? • What is the force that causes a momentum change? • If a train gets off-track, why would its momentum be difficult to stop? • Why is it correct to say that boxing is all about momentum? • Why does the velocity of a martial arts expert’s hand play an important role in breaking the stone? • Why would it be better to have several small collisions rather than one large one? • How do seat belts and safety features help in a crash in terms of momentum? • In football the how does the collision of 2 players conserve momentum? • If you lift 3 spheres in a Newton’s Cradle, how many would you expect to come out on the other side and why? • In bowling, which object has the most momentum (pins or bowling ball) and why? • Why does the 4 ball loose momentum in the billiards scenario? • Air Hockey: Why would it be beneficial to study conservation of momentum in an environment with zero friction? • Baseball: where does the momentum from the baseball players swing go? • Water Balloon: Where does the momentum to break the balloon come from? • Choose one picture to write a 5 sentence paragraph about. You will discuss: • Where does the momentum begin in the picture • what are the factors that affect momentum • What does the Law of Conservation of Momentum state • How is momentum transferred and conserved in the picture. (do they objects stick together or bounce off?)

  8. Wednesday December 14, 2011 Warm Up Classwork #58 Ne #59

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