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Understanding Linear Momentum and Collisions in Physics

Learn about linear momentum, impulse, conservation of momentum, types of collisions, and kinetic energy conservation in this educational video. Expllore real-world examples and equations related to momentum and collisions dynamics.

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Understanding Linear Momentum and Collisions in Physics

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  1. Momentum and Collisionshttp://www.youtube.com/watch?v=4ZrXUc6SA7c

  2. More • http://www.youtube.com/watch?v=WxWHm8V4lZo&feature=relatedApophis in 2029 or 2036.

  3. Linear Momentum • Linear Momentum is a object with m and v. • Symbol for momentum is p. • Momentum is a vector. With direction that of velocity. • Dimensions of p are m and v. • SI units of p are what? • What are some examples of p?

  4. More Linear Mom • What has more p an object with a large m or one with a smaller mass? • What has more p an small object with a large v or a large object with a small v? • What are some recent examples of an object with a large v and small m? • Equation for p = mv.

  5. Change in Momentum • A change in p requires a F during a change in t. • Ft = p Ft = mvf – mvi. Impulse p theorem • Equations states that a small force over a long t period produces the same change in p as a large force acting during a short time. • Follow through Greater change in p if object in contact for a longer period of t. • http://www.physicsclassroom.com/curriculum/momentum/mom1.pdf

  6. Stopping times and distance • Depend on I=p theorem.

  7. Conservation of Momentum • Momentum is conserved. • http://www.physicsclassroom.com/mmedia/momentum/index.cfm physics classroom • http://www.bing.com/videos/search?q=car+airbag+collisions&view=detail&mid=624655912362DA14613B624655912362DA14613B&first=0&FORM=LKVR16 Car seat

  8. Conservation of Momentum Continued • Mom + Mom = Mom + Mom • MV1 + MV2 = MV1 + MV2 • Before Col = After Col • Two types of Collisions. Inelastic and Elastic. • Regardless Momentum is conserved.

  9. Collisions Conservation of Momentum • Forces in real world situations are not constant. Always changing. • Total p remains constant in any type of collision. • Total KE is not always conserved because some is lost due to deformation of the object, heat, sound.

  10. Perfectly inelastic collisions • When two objects collide and move as one • m1v1 + m2v2 = m1v1 + m2v2 • m1v1 + m2v2 = (m1 + m2)v

  11. KE not constant in inelastic collisions • Total KE not constant when objects collide and stick together. • The reason is that in inelastic collisions objects do not keep there shape. They deform.

  12. Elastic Collisions • Two objects collide and maintain or return to their original shape. • They do not stick together. • Most collisions are not truly elastic or perfectly inelastic. Because energy is lost. • KE is conserved in elastic collisions.

  13. Equation for elastic • m1v1 + m2v2 = m1v1 + m2v2 • KE equation • ½ m1v1^2 + 1/2m2v2^2 = 1/2m1v1^2 + 1/2m2v2^2 • Table 6-2

  14. Collision lab • Phet Lab Colorado: Collisions in one dimension. • http://phet.colorado.edu/sims/collision-lab/collision-lab_en.html • Lab one • Lab two

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