POWER.

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Presentation transcript:

POWER

Lifting Weights https://www.youtube.com/watch?v=GKVU0dfjO3c

What is Power? The amount of work done Per unit of time Power=Work/time Units: J/sec or Watt 1 horsepower= 750 Watts

Momentum Which of the following has momentum?

What is momentum? The quantity of motion that an object has “mass in motion”

If momentum is “mass in motion” what do you think the formula for momentum is? momentum= (mass)(velocity) p= mv Units Mass: kg Velocity: m/s

Law of conservation of momentum http://www.tubechop.com/watch/4077153 For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. That is, the momentum lost by object 1 is equal to the momentum gained by object 2.

Law of conservation of momentum Collisions momentum (p) initial= p final

Problem 1 Same mass one moving one rest http://www.tubechop.com/watch/4077316

Problem 2 Same speed same mass http://www.tubechop.com/watch/4077407