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BELL RINGER 12/8: Summarize what you did in Tuesday’s collision
activity.
OBJECTIVE: SWBAT define conservation of momentum; SWBAT define and calculate for inelastic collisionsAGENDA: • Notes• Group Practice• Exit Ticket
HOMEWORK: 1-5, 7-8a on Worksheet
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Conservation of Momentum
• Momentum in a system is conserved• Pfinal=Pinitial
• In general, for two objects that are colliding, the equation looks like:
m1v1 + m2v2 = m1v1 + m2v2
But, the equation is rearranged or changes slightly depending on the type of collision!
initial final
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Applying conservation of momentumEX: Two ice skaters meet in the center of the rink and come to rest. They now push off against one another. One skater, with a mass of 54-kg, acquires a speed of 0.95 m/s. What is the speed of the other skater, whose mass is 61-kg?
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Conservation of Momentum + Collisions
• Momentum in the system (objects colliding) is conserved as long as there are no external forces acting on the system
• That doesn’t mean momentums within the system don’t change; the sum remains the same, but momentum will transfer b/w objects
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COLLISIONSThere are two types of collisions:1.Inelastic: momentum is conserved, but kinetic energy is not; objects stick together upon collision. When the maximum amount of KE is lost to other forms of energy, it is called a completely inelastic collision. 2. Elastic: momentum and kinetic energy are conserved
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INELASTIC COLLISIONSWhen one object starts at rest and the objects stick together after the collision and have the same final velocity, the equation is rearranged to:
m1v1 + m2v2 = m1v1 + m2v2
m1v1 = (m1 + m2) v
Note: one object won’t always start at rest, so the m2v2
term can come back!
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INELASTIC COLLISIONSEX: On a touchdown attempt, a 95.0-kg running back runs to the right towards the end zone at 3.75 m/s. An 111-kg linebacker moving to the left at 4.10 m/s meets the runner in a head-on collision. If the two players stick together, what is their velocity immediately after the collision?
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BELL RINGER 12/5: Answer Choices for Question 4:STANDARD: EMI 601
OBJECTIVE: SWBAT solve collision problems using the conservation of energy equationsAGENDA: • Group Practice• Start Problem Set
HOMEWORK: Problem Set due Monday (check your email); QUIZ MONDAY!
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BELL RINGER 12/5:
What is the general equation for conservation of momentum?
OBJECTIVE: SWBAT solve collision problems using the conservation of energy equationsAGENDA: • Group Practice• Start Problem Set
HOMEWORK: Problem Set due Monday (check your email); QUIZ MONDAY!
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REVIEWA train with a mass of 3500-kg is traveling at 20 m/s when it collides with another train that has a mass of 2700-kg and is traveling 15 m/s. If the objects stick together upon collision, what will be the trains’ velocity right after colliding?
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GROUP PRACTICE
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