PHY211 General Physics I CH 9 Brad Angelina Do Physics 1 14 2019 Momentum Impulse Brad Pitt 80 kg and Angelina Jolie 50 kg enjoy a relaxing drive across the south of France in their red sports car 1400 kg Starting at rest at a stop sign they accelerate to a cruising speed of 35 m s then slow back down to rest as they approach an upcoming intersection a What is the combined linear momentum of Brad and Angelina s including car as a system at the stop first sign b What is the combined linear momentum of this system at cruising speed c What are Brad and Angelina s linear momentum respectively at cruising speed d Calculate individual and combined impulse vectors for the Brad Angelina car system as they go from rest to cruising speed e It takes 8 seconds for the car to go from rest to cruising speed what is the average net force exerted on Brad Angelina and the car f What is the net impulse vector for the road as the car goes from rest to cruising speed Which of Newton s Laws explains this phenomenon g Determine the impulse vector for the car seat due to Angelina as the car accelerates to cruising speed PHY211 General Physics I CH 9 Brad Angelina Do Physics 1 14 2019 Enter the jilted ex wife In a hurry for a coffee date with a French mime role played by Vince Vaughn naughty naughty Brad s jilted ex wife Jennifer Aniston 45 kg speeds along at 40 m s in her blue convertible 1300 kg Unfortunately she doesn t see the red sports car in the middle of the intersection ahead of her vbrad Angelina 25 m s and she collides at a 90o angle into the side of Brad and Angelina s vehicle Scenario 1 Inelastic Collision During impact Jennifer s convertible collides inelastically with Brad and Angelina s car and both vehicles are thrust into the intersection 1 What is the linear momentum of Jennifer and her car just before impact 2 What is the momentum of Brad Angelina and their car just before impact 3 What is the combined momentum of this system immediately after impact 4 What is the velocity vector for each vehicle immediately following impact 5 Calculate the impulse vector for each vehicle including drivers due to the collision 6 Suppose the impact lasts for 0 5 sec What is average impact force exerted on each vehicle 7 How does the impact force received by Jennifer s vehicle compare with the force received by Brad and Angelina s 8 How does the acceleration due to impact of Jennifer s vehicle compare with the acceleration of Brad and Angelina s Calculate the respective accelerations 9 If Jennifer were driving a 2500 kg SUV instead of a small car would her vehicle receive more less or the same impact force as Brad and Angelina s car Explain PHY211 General Physics I CH 9 Brad Angelina Do Physics 1 14 2019 Scenario 2 Elastic Collision Alternatively as Jennifer s car collides into the side of Brad and Angelina s the impact knocks Brad and Angelina s car diagonally into the intersection but the vehicles do not become attached and remain independent of each other a perfectly elastic collision 1 What is the combined momentum of this system immediately following impact 2 What is the total momentum for the 2 vehicle system just after impact 3 Calculate the velocity for the system pre impact 4 What is the KE of each vehicle w passengers respectively prior to impact 5 Calculate the total KE for the 2 vehicle system just after impact 6 Express the post impact total momentum and KE by components 7 Calculate the system velocity post impact 8 What is the velocity of each vehicle w passengers respectively immediately following impact refer to textbook 9 What is the linear momentum of each vehicle w passengers respectively immediately after impact 10 What is the KE of each vehicle w passengers respectively immediately after impact
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