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Transcript
Ch. 9 Impulse and Momentum Impulse (I) force X change in time I=FΔt Momentum (p) mass X change in velocity p=mΔv Impulse is equal to Momentum FΔt = mΔv or F=mΔv/Δt • The greater the time to stop the less the force • The shorter the time to stop the greater the force • This the principle behind air bags LT#1/LT#2 1. Momentum = ________ x _________ 2. What is the momentum of an object that has a mass of 10 kg and is moving at 10 m/s? 3. Impulse = ________ x _________ 4. It takes applying 50 N of force for 3 sec to stop an object: what impulse was applied to stop that object? 5. How much force is felt by a 10 kg object traveling at 5 m/s, that comes to a stop in 2 sec.? Conservation of Momentum LT#3/LT#4 Collisions/Explosions lab And Practice Problems LT#5 1. A hockey puck has a mass of 0.115 kg and is at rest. A player makes a shot, exerting a force of 30 N for 0.16 s. With what speed does it head toward the goal? 2. A 95 kg fullback, running at 8.2 m/s, and a 128 kg tackle collide. Both players end up with zero speed. A. What was the fullback’s momentum prior to the collision? B. What was the change in the fullback’s momentum? C. What was the change in the tackle’s momentum? D. How fast the tackle moving originally? 3. A 2,575 kg van collides with a 825 kg car at rest. They move off together at 8.5 m/s. What was the original speed of the van?
