Impulse and Momentum Physics

Bell Ringer 1/5/17 (5 minutes) Number all problems on the worksheet. Given the formula for momentum Label all the known and unknown in example problems 1-3 on the front of the ch.6 momentum and impulse worksheet given. Pick up a calculator. If time permits solve them.

Objectives We will Understand the concepts of momentum & impulse I will apply my understanding of momentum & impulse to Interpret & solve questions related to real life scenarios of momentum & impulse TEK: 6C calculate the mechanical energy of power generated within impulse applied to, and the momentum of a physical system.

Intro to topic: MOMENTUM & IMPULSE Example Problems Complete worksheet AGENDA Intro to topic: MOMENTUM & IMPULSE Example Problems Complete worksheet Egg drop project Information

Video Intro http://study.com/academy/lesson/linear-momentum-definition-equation-and- examples.html#transcriptHeader Or https://www.youtube.com/watch?v=2htckwDkugI

p = mv Momentum The momentum of an object is: The product of an object’s ______ and its object’s ________. p = mv Momentum is a ________quantity. (It has magnitude & direction). units - _______

p = mv Momentum The momentum of an object is: The product of an object’s mass and its object’s velocity. p = mv Momentum is a vector quantity. units - kg m/s

Momentum In symbols: p = mv p m v

Momentum Example Problem 1 1. A 2250 kg pickup truck has a velocity of 25 m/s to the east. What is the momentum of the truck?

Momentum Example Problem 2 2. A deer with a mass of 146 kg is travelling with a momentum of 2500 kg m/s to the south. How fast is the deer travelling?

Momentum Example Problem 3 3. The earth is moving with a momentum of 1.78x 1029 kgm/s If the Earth is moving in its orbit with a velocity equal to 2.98x 104 m/s forward, how massive is the earth?

Units Quantity Units Force time mass velocity Impulse

Units Quantity Units Force N time s mass kg velocity m/s Impulse N.s

I =Δp= Δ(m*v) Impulse & Momentum The impulse exerted on an object equals the object’s change in ____________. In symbols: I = Dp I =Δp= Δ(m*v)

I =Δp= Δ(m*v) Impulse & Momentum The impulse exerted on an object equals the object’s change in momentum. In symbols: I = Dp I =Δp= Δ(m*v)

Impulse https://www.youtube.com/watch?v=lPzGSjIoW7c

Real Life Scenarios

Impulse – Momentum Relationships

Impulse, I or Δp In symbols: ∆p = F Δt ∆p F Δ t

Impulse is a vector quantity. Common units of impulse: N s

Impulse Example Problem 4 A 1400 kg car moving east with a velocity of 15 m/s collides with a utility pole and is brought to rest in 0.30 s. What is the force exerted on the car during the collision?

Impulse Example Problem 7 A 2240 kg car travelling to the west slows down uniformly from 20 m/s to 5 m/s. How long does it take the car to decelerate if the force on the car is 8410N to the east?

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