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PHYS 031 (24)
Jie Yang (24)
Lecture

Phys 031 Chapter 7A.docx

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Department
Physics
Course
PHYS 031
Professor
Jie Yang
Semester
Spring

Description
Chapter 7: Newton’s Third Law Block B: Block A: N T (A) Fs T (B) Fg (B) Fg (A) Joint: T2 T TA Block B: Block A: x – direction: y – direction: T – Fs = 0 T – FgA = 0 y – direction: N – FgB = 0 N = FgB Joint: Joint is stationary. x – direction: T2 cos45° - T = 0 T2 cos45° = T y – direction: T2 sin45° - TA = 0 T2 sin45° = TA sin 45° = cos 45° T = TA If Fs = Fs max Fs max = * N = * mB * g T = Fs max = * mB * g T = TA = mA * g * mB * g = mA * g mA = * mB Block A: 1 kg Block B: 2 kg N N Fk1 T Fk2 T Fg1 Fg2 Block A: Eq. 1: x – direction: T – Fk +Fg1 sin20° = 1 a1x y – direction: N – Fg1 cos20° = 0
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