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
• The forces on a stationary object must balance.

4. Our First Physics Problem

• Identify what we know and what we need.

5. Under­determined

• unknowns
• 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 \(g=9.8\u{N/kg}\)

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
• \(S\le \mu_SN\)

13. Restoring Forces

• restoring force
• hooke's law
• spring constant
• \(T=k\Delta L\)
• \(N=k\Delta L\)

14. Torque

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

15. Torque Direction

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

16. Balancing Act

17. Torque and Equilibrium

18. Assessment Objectives

19. Force Tables

• force table

20. Solving Force Problems

21. Changing Between Mass and Weight

22. A Block on a Ramp

• inclined plane

23. Slipping Problems

24. Calculating Torque

25. Torque Problems