lecture18_1100_S12

# lecture18_1100_S12 - PHYS 1100 Spring 2012 I II Newtons...

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I. Newton’s Second Law Examples with Multiple Objects II. Kinematic Variables A. Displacement B. Average Speed C. Average Velocity D. Average Acceleration PHYS 1100 Spring 2012 Reading for Friday: 2.1 – 2.6, 4.1 – 4.4

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EX1: Three boxes of mass m 1 =1.0 kg, m 2 =2.0 kg, and m 3 =3.0 kg, are pushed to the right across a frictionless horizontal surface by a horizontal force of 12 N. The boxes are stacked on top of each other with the lightest on the top and the heaviest on the bottom. The force acts on the heaviest box. What is the acceleration of all three boxes, the magnitude of the force between m 1 and m 2, and the magnitude of the force between m 2 and m 3? What is the minimum value for μ s between the boxes if they don’t slip as they are pushed? PHYS 1100 Spring 2012
EX2: A jogger wants to run out and back along a 4 km path that runs due north of where she starts. How much time will she take if she wants her average speed to be 2.5 m/s? How far down the path should she run if she only wants to run for 40 minutes at a speed of 2.5 m/s? PHYS 1100 Spring 2012

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A jogger wants to run out and back along a 4 km path that runs due north of where she starts. If it takes her 25 minutes to run out to the end of the path and 30 minutes to run back, what is her average velocity in km/hr and m/s… a) on her way out?
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lecture18_1100_S12 - PHYS 1100 Spring 2012 I II Newtons...

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