Physics131_L16WI10

# Physics131_L16WI10 - Physics 131 - Mechanics Le cture16 Fe...

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Physics 131 - Mechanics Lecture 16 February 19, 2010 Homeyra Sadaghiani

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October 24, 2010 Physics 131 - Lecture 16 Announcements HW#7 is due at 9 a.m. on Wed. February 24 th Tutorial Homework is due today. 2
Week Date L# Lecture topic Text reading HW 5 1-Feb 10 Equilibrium, using the 2nd Law 6.1-3 (12 P)   3-Feb 11 2nd Law Application: Friction, Drag 6.4-6 (12 P) HW#4   5-Feb 12 Newton’s 3rd Law: Interaction 7.1-5 (19 P) 6 8-Feb 13 Uniform circular motion 8.1-7 (18 P)   10-Feb 14 Momentum, Impulse & conservation of momentum 9.1-3 (13 P) HW#5   12-Feb F1 Conservation of momentum Tutorial 7 15-Feb H2 Holiday (Presidents' Day)   17-Feb 15 Inelastic collisions 9.4-6 (12 P) HW#6   19-Feb 16 Energy 8 22-Feb 17 Potential energy and elastic collision 11.1-3 (10 P) HW#3 26-Feb E2 EXAM 2- Chapters 5-9 October 24, 2010 Physics 131 - Lecture 16 Lecture Schedule We are here! 3

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October 24, 2010 Physics 131 - Lecture 16 Example : A Karate Collision With an expert karate blow, you shatter a concrete block. Consider that you hand has a mass of 0.70 kg, is initially moving downward at 5.0 m/s, and stops 6.0 mm beyond the point of contact. (a) What impulse does the block exert on your hand? (b) What is the approximate collision time and average force that the block exerts on your hand? ˆ ˆ (0.70 kg)(5.0 m/s ) 3.5 N s I p m v y y = ∆ = ∆ = = r r r ˆ 5.0 m/s( ) v y ∆ = 1 2 av y v t v t ∆ = ∆ ≈ ∆ ∆ 2 2(0.006 m) 0.00240 s 5.0 m/s y t v ∆ = = = av ˆ (3.5 N s ) ˆ = 1,500 N (0.00240 s) I y F y t = = r r 4
October 24, 2010 Physics 131 - Lecture 16 Example : A Crumpled Car A car equipped with a 80 kg crash dummy drives into a massive concrete wall at 25 m/s (about 56 mi/h).

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## This note was uploaded on 10/24/2010 for the course PHY PHYSICS 13 taught by Professor Mylander during the Spring '09 term at Cal Poly Pomona.

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Physics131_L16WI10 - Physics 131 - Mechanics Le cture16 Fe...

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