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lecture15_1100_S12

lecture15_1100_S12 - PHYS 1100 I Newtons Second Law...

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I. Newton’s Second Law Examples with Multiple Objects PHYS 1100 Spring 2012 Reading for Monday: Review Ch. 5 & 6
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EX1: A crate of mass m 1 rests on a frictionless horizontal surface. The crate is connected to a box of mass m 2 that hangs off the surface by a massless rope that lies across a massless, frictionless pulley. Find the acceleration of the crate, the normal exerted by the surface on the crate, and the tension in the rope. PHYS 1100 Spring 2012 m 1 m 2 v 1 v 2 a 1 a 2 F N F g 1 F T 1 + x + y + x + y m 1 : F N F T 1 F g 1 m 1 a x y 0 0 0 N T - m 1 g m 1 a 0 F 1 x = m 1 a 1 x T = m 1 a F 1 y = m 1 a 1 y N - m 1 g = 0 a 1 = a 2 = a F 1 = F 2 = T
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EX1: A crate of mass m 1 rests on a frictionless horizontal surface. The crate is connected to a box of mass m 2 that hangs off the surface by a massless rope that lies across a massless, frictionless pulley. Find the acceleration of the crate, the normal exerted by the surface on the crate, and the tension in the rope. PHYS 1100 Spring 2012 m 1 m 2 v 1 v 2 a 1 a 2 F T 2 F g 2 + y m 2 : F 1 y = m 2 a 2 y m 2 g - T = m 2 a a 1 = a 2 = a F T 1 = F T 2 = T + y T = m 1 a m 2 g - T = m 2 a m 2 g = m 1 a + m 2 a a = m 2 g m 1 + m 2 +
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CT1: A crate of mass m 1 rests on a rough horizontal surface.
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