Lecture5_Fall2008

Lecture5_Fall2008 - Chapter 5: Homework Chapter 5: Linear...

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1 Chapter 5: Linear Momentum Plan 1. Definition of linear momentum 2. What can change linear momentum? 3. Impulse 4. Why linear momentum is conserved 5. Solving Problems Chapter 5: Homework z Key Terms and Matching Definitions z Review Questions: 1, 4, 6, 8, 12, 15, 18, 19 z Exercises: 2, 5, 8, 12, 15, 17 z Problems: 1, 2, 3, 4 Definition MOMENTUM= MASS × VELOCITY or, in shorthand notation, p= m v Linear momentum is a vector quantity! Linear momentum Linear Momentum: Examples Problem 1 A car with a mass of 1000 kg moves at 20 m/s. What is the linear momentum of the car? Answer: P = 1000 (kg) × 20 (m/s) = 20,000 kg·m/s or 20,000 N·s Proof: kg·m/s = N·s
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2 2. A 40-kg boy is moving horizontally at 2 m/s. What is the linear momentum (p) of the boy? Answer: p = 40 (kg) × 2 (m/s) = 80 kg·m/s or p = 80 N ·s Problem 3 . A 5-kg cannonball is moving at 40m/s. What is its linear momentum (p) ? Answer: p = 5(kg) × 40(m/s)= 200 kg·m/s or p = 200 N·s Impulse Definition: Impulse = force × time interval or, in shorthand notation, Impulse= F· Δ t Impulse is a vector quantity!
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This note was uploaded on 05/27/2011 for the course PSC 1121 taught by Professor Khankasayev during the Fall '08 term at Florida A&M.

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Lecture5_Fall2008 - Chapter 5: Homework Chapter 5: Linear...

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