PHYS 1441 – Section 002 Lecture #17. Monday, Nov. 15, 2010 Dr. Jae hoon Yu. Linear Momentum Conservation Collisions Center of Mass Fundamentals of Rotational Motion. Today’s homework is homework #10, due 10pm, Tuesday, Nov. 23!!. Announcements. Quiz #5

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ByChapter 5 Momentum Ewen et al. 2005 ). 5.2 Collisions. Objective: Apply the law of conservation of momentum to both elastic and inelastic collisions of two objects. Conservation of Momentum and Collisions.

ByChapter 7. Momentum. 7.1 Momentum. Mass is inertia and momentum is inertia in motion momentum = mass × velocity momentum = mv Measured in N·s or kg·m/s Moving object can have large momentum if it has a large mass, a high speed, or both. 7.2 Impulse Changes Momentum.

ByMomentum and Inertia. Momentum. Momentum = mass x velocity MV = P Momentum is inertia in motion. A moving object has more p than an object with less m. An object at rest has no p (v = 0). Momentum. If the p of an object changes, the m, v, or both MUST change.

ByMomentum: Unit 5. What is Momentum?. Momentum: ______ in motion The more _______ an object has, the more ________ there is possible. ________ affects the momentum of an object. EX. A fast car can have more momentum than a slow truck w/ greater mass

ByConservation of momentum. Momentum before = momentum after p o = p m a v oa + m b v ob = m a v a + m b v b m a v oa + m b v ob = (m a + m b ) v ab. Conservation of momentum. Momentum before = momentum after p o = p m a v oa + m b v ob = m a v a + m b v b

ByMechanics & Thermodynamics. Physics 1210/1310. Lecture C1-7, chapter 6 - 8. Work and Energy. http://www.pa.uky.edu/~phy211/VecArith/. Group Task Is the total work done by all forces positive, negative, or zero?. Find speed from KE problem – ex 6.4. W tot = W T + W f + W w + W n.

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ByCollisions Summary. Elastic Collisions . Total momentum is conserved Total kinetic energy is conserved. Inelastic Collisions. Total momentum is conserved Total kinetic energy is NOT conserved.

ByCollisions. basically include every interaction. § 8.3–8.4. All Interactions. Interacting objects apply equal and opposite forces (and impulses) to each other Total momentum is conserved. Elastic Collisions. Objects bounce apart after collision

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ByTypes of Collisions. Elastic collisions-Two objects collide, temporarily misshape, and spring away from each other… KE and momentum are conserved . Inelastic collisions conserve momentum but not KE…some energy is lost to non-conservative forces such as thermal energy/friction.

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ByChapter 11. Gases. 10. 1 Kinetic Molecular Theory. State the kinetic-molecular theory of matter, and describe how it explains certain properties of matter. List the five assumptions of the kinetic-molecular theory of gases. Define the terms ideal gas and real gas.

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ByElastic Collisions and Recoil (The anti-collision). DN. What is the difference between an elastic and an inelastic collision? What does it mean that “momentum is conserved” before, during and after a collision? What is the momentum of a 16,000 kg train traveling at 10 m/s?

ByMOMENTUM & IMPULSE. Momentum : product of a system’s mass it’s linear velocity Δ P = m Δ V = m ( V f – V i ) Units: kg·m /s = N·s More massive…..more mo’ Greater velocity….more mo ’ Is a vector Momentum provides inertia. Ex.1

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