Ch 9 Notes.  Momentum: inertia in motion ρ = m v ρ (rho) units of kgm/s VECTOR QUANTITY Inertia of an object depends on its mass AND velocity  Impulse.

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Presentation transcript:

Ch 9 Notes

 Momentum: inertia in motion ρ = m v ρ (rho) units of kgm/s VECTOR QUANTITY Inertia of an object depends on its mass AND velocity  Impulse = Change in Momentum units of Ns Based on definitions of acceleration: a = F/m & a = Δ v/t so F/m = Δ v/t Cross multiply to get F t = m Δv

 Impulse = Change in Momentum units of N*s Impulse (I) = FΔt  A measure of how quickly momentum changes.  Or how quickly a force acts upon an object.

Large Force, Little Time Little Force, Larger Time

 For closed systems, the sum of the momenta must be conserved between the objects in the system.  Σρ initial = Σρ final Nonstick perfectly elastic m 1 v 1i + m 2 v 2i = m 1 v 1f + m 2 v 2f Sticky inelastic m 1 v 1i + m 2 v 2i = (m 1 +m 2 ) v f

 If momentum must be conserved, then…  The impulse of an object and its momentum must be conserved, so…  ρ = m v and I = FΔt  Therefore: mΔv = FΔt for objects in the same system

 What is the momentum of a 250kg car that is traveling at 9 m/s?

 What is the impulse of a ball that collides with a wall in.03s with a force of 150N?

 What is the change in momentum of an object that has collides with a wall with an impulse of.15 N*s?

 Review LOCOE Quizzes  Review Impulse and Momentum  Momentum Lab  Collisions

 Warm-Up  Electrostatics  Conservation of Momentum Lab  Exploding Carts!!  Change in Momentum: Collisions

 Elastic Collisions  Two objects collide and bounce off of one another  Ex: Tennis ball and racket  Momentum is conserved  m 1 v 1i + m 2 v 2i = m 1 v 1f + m 2 v 2f

 Inelastic Collisions  Two objects collide and stick together  Two masses become one mass moving at a slower velocity  m 1 v 1i + m 2 v 2i = (m 1 +m 2 ) v f

 A 2kg bowling ball is rolled into a.5kg pin. The ball is moving with a velocity of 2.5m/s and collides elastically with the pin. After the collision the ball is moving at.25 m/s. How fast was the pin moving after the collision?

 Circuits Warm-Up  Need calculators  Momentum and Impulse Lab  Complete Collision Problems and turn in on calcs  Momentum/Impulse Quiz Monday

 Wear goggles  No one else should be near the table when you chop  You must chop THROUGH the board  If you stop at the board you will hurt yourself  Close your fingers when you chop  If you don’t you could hurt them