Index for
Chapter 1
Equilibrium

1. What are Forces?

• force
• vector

2. Our First Forces

• weight
• newton
• normal force
• tension
• Weight ($W$) measured in Newtons (N)
• Normal Force ($N$) measured in Newtons (N)
• Tension ($T$) measured in Newtons (N)

3. Static Equilibrium

• static equilibrium

4. Our First Physics Problem

• Identify what we know and what we need.

5. Underdetermined

• unknowns
• mega
• metric prefix
• We need two equations to solve for two unknowns,
  three equations to solve for three unknowns, and so forth.

6. The Second Dimension

• Horizontal and vertical forces are independent
  of each other, and balance separately.

7. Static Friction

• force diagram
• static friction
• Static Friction ($S$) measured in Newtons (N)

8. Contact Forces

• noncontact

9. Adjustable vs Fixed Forces

• fixed force
• adjustable forces
• Weight ($W$) measured in Newtons (N)
• $W=mg$, where $g=9.8\mathrm{N}/\mathrm{kg}$

10. Mass vs Weight

• mass
• weight
• Mass ($m$) measured in kilograms (kg)
• Weight ($W$) measured in Newtons (N)

11. Adjustable Limits

12. The Breaking of Static Friction

• coefficient of static friction
• Coefficient of static friction (${\mu }_S$) no units
• $S\le {\mu }_{S}N$

13. Torque

• torque
• lever arm vector
• newton-meters
• Torque ($\mathrm{\tau }$) measured in N m
• $\mathrm{\tau }=rF\sin \theta$

14. Torque Direction

• The direction of the torque is the direction you need to turn $\overrightarrow{r}$
  so that it points in the direction of $\overrightarrow{F}$. If $\overrightarrow{r}$ points in the same (or opposite) direction as $\overrightarrow{F}$, then the torque is zero.

15. Balancing Act

16. Torque and Equilibrium

17. Assessment Objectives

18. Force Tables

• force table

19. Solving Force Problems

20. Changing Between Mass and Weight

21. A Block on a Ramp

• inclined plane

22. Slipping Problems

23. Calculating Torque

24. Torque Problems