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Unformatted text preview: Chapter 4B 1 Equilibrium Some applications of Newton’s laws involve objects in equilibrium . • An object in equilibrium is not accelerating. • Its velocity is constant (maybe zero). • The net force on the object is zero. Σ r F = Σ F x = Σ F y = Chapter 4B 2 Equilibrium Accelerating objects are not in equilibrium. Σ r F = m r a Σ F x = ma x Σ F y = ma y Chapter 4B 3 Sample Problem #1 Are the blocks in equilibrium? How do we know? What is the net force acting on each block? What are the individual forces acting on each block? A C B workbench m A g = 1 N m B g = 2 N m C g = 4 N Three metal blocks are stacked on a workbench. Chapter 4B 4 Sample Problem #2 A helicopter is moving horizontally at constant speed. The helicopter weighs 50000 N. The lift force L generated by the rotating blade makes an angle of 20.0 ° with respect to the vertical. Air resistance R opposes the helicopter’s motion. We would like to calculate L and R ....
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This note was uploaded on 04/28/2008 for the course PHY 111 taught by Professor Scott during the Winter '07 term at Saginaw Valley.
 Winter '07
 Scott
 Force

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