Index for
Chapter 6
Energy

1. Energy Conservation

• conserved
• $E_f=E_i+\mathrm{\Delta }E$

2. Work

• work
• Work ($W$) measured in J
• $W=Fd\cos \theta$
• $E_f=E_i+W$

3. Kinetic Energy

• kinetic energy
• Kinetic Energy ($E_K$) measured in J
• $E_K=\frac{1}{2}m{v}^2$

4. Frictional Work

5. Gravity and Work

• gravitational potential energy
• potential energy
• Gravitational Potential Energy ($E_G$) measured in J
• $E_G=mgh$

6. Springs

• spring constant
• stiffness
• Spring Constant ($k$) measured in N/m
• Spring Potential Energy ($E_S$) measured in J
• $F=k(L-L_0)$
• $E_S=\frac{1}{2}k(L-L_0{)}^2$

7. Potential Energy

• If a system at rest moves spontaneously, it will move so as to decrease its potential energy.

8. Height from What?

• You can measure the height from any reference point you choose,

9. Collisions

• elastic
• inelastic
• maximally inelastic

10. Power

• power
• watts
• kilowatt-hours
• Power ($P$) measured in W
• $P=\frac{\mathrm{\Delta }E}{\mathrm{\Delta }t}$

11. Power Flow

• kilocalories
• $\mathrm{\Delta }E=(P_{in}-P_{out})\mathrm{\Delta }t$

12. Intensity

• intensity
• Intensity ($I$) measured in W/m²
• $I=\frac{P}{A}$

13. Assessment Objectives