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Ch. 9 Momentum and Its Conservation Milbank High School Sec. 9.1 Impulse and Momentum • Objectives – Compare the system before and after an event in momentum problems – Define the momentum of an object – Determine the impulse given to an object – Recognize that impulse equals the change in momentum of an object Momentum • What is momentum? • The Minnesota Vikings have momentum entering the final weeks of the season… • Anything that is moving has momentum • Depends on what? Momentum • Momentum = mass * velocity • In physics, the symbol for momentum is “p” sssooo… • p=m*v • kg·m/s Which has more momentum, a supertanker tied to a dock or a raindrop falling? Momentum • Determine the momentum of a ... – 60-kg halfback moving eastward at 9 m/s. • 60 x 9 = 540 kg·m/s east – 1000-kg car moving northward at 20 m/s. • 1000 x 20 = 20,000 kg·m/s – 40-kg freshman moving southward at 2 m/s. • 40 x 2 = 80 kg·m/s Impulse and Momentum • Impulse = Change in momentum • Impulse – The product of the average net force exerted on an object and the time interval over which the force acts – N•s Real Life Applications.. • Sports… – Follow-through! – Gymnastics Mats • Cars… – Airbags! – Before airbags…. – Bumpers • Eggs… • Jumping… – Knees – Shoes Review • Can a bullet have the same momentum as a truck? Sec. 9.2 The Conservation of Momentum • Objectives – Recognize the conditions under which the momentum of a system is conserved – Apply conservation of momentum to explain the propulsion of rockets – Solve conservation of momentum problems in two dimensions by using vector analysis The Law of Conservation on Momentum • The total momentum of two objects before a collision is equal to the total momentum of the two objects after the collision. Two Particle Collisions – Inelastic collisions mAvA1 + mB1vB1 = mAvA2 + mBvB2 Propulsions • We can also use: pA2 = -pB2 mAvA2 = -mBvB2 Example Problem Pg. 212