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PHYS 031 (24)
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Lecture

# Phys 031 Chapter 6.docx

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School
Department
Physics
Course
PHYS 031
Professor
Jie Yang
Semester
Spring

Description
Chapter 6: Dynamics I: Motion Along a Line  Equilibrium: an object on which the net force is zero  Equilibrium: Newton’s First Law: Fnet = 0 N o Choose Coordinates o Identify Contact/Long-Range Forces to draw the Free Body Diagram  Gravitational force on an object of mass m on Earth is labeled Fg o Fg = mg (m = mass in kg; g = 9.8 m/s² Ө Ө T T 3 m 3 m ӨӨ 20 kg Fg At static equilibrium: Fxnet = 0 = TӨ - TcoӨ Fynet = 0 = TӨi+ TsiӨ - Fg 0 = 2TsӨn- Fg T = Fg / 2Өin T = [(20) (9.8)] Ө ) = [(20) (9.8)] / (2(2/3)) = [3(20) (9.8)] / (4) = 147 N Ө At dynamic equilibrium: Fxnet = 0 = Tcos10° + Tcos10° - f Fynet = 0 = Tsin10° - Tsin10° F = 1000 N = frictional force 2Tcos10° - 10
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