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Informal sessions:

o Tu 3:30-4:20pm, RAS 218;

o Fri 4-4:50pm, ECJ 1.204.

Lecture 29 (iq25)

Static equilibrium conditions:

1. F=F₁+F₂+ …=0.

2. t= t₁ + t₂ + …=0, about one pivot point.

Torque about P due to gravity

· t=Mgx_cm

Equilibrium: Stable, unstable, or neutral

Examples:

§ Choice of pivot points

§ Determine the critical condition through the use of inequality

Schedule of this week:

· Read Chapter 14 (It is a relatively easy chapter) Start working on HW11.

· Tuesday: Informal session 3:30-4:30

· Wednesday lecture: Complete Chapter 14. Plan to complete HW11.

· Friday lecture: Review unit 3

· Friday’s informal session: hw11 and review on unit 3.

· Due date of HW11: 4am Nov 10. (Monday, or Sun evening)