Physics 213 Discussion # 14 Wednesday 9-19-2007

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1. Today's OTQ is Q14 = 7b

2. Go over wkb pgs 59 - 61

3. Do atwood machine problem.

4. Finish H&S Part II

5. Today's Def's
Chapters 7: Mechanical Work
D8
7-1 Define work done by a constant force on a system.
7-2 Define work done by a varying force on a system.
7-3 Give two different formulas for the dot product (scalar product) of two vectors.
7-4 Force due to a Hooke's Law Spring is defined by Fs = _________.
7-5 Work done by a spring on an object is Ws= ____________.

D9
7-6 Kinetic energy is energy due to ___________.
7-7 Give the formula for kinetic energy, K = __________.
7-8 State the work &endash; kinetic energy theorem in words and equation form.
7-9 Define power.
Chapter 8: Potential Energy
D10
8-1 Define gravitational potential energy,
8-2 Define spring potential energy,
8-3 Ko
Ugo=
Uso =
W
K
Ug =
Us =
DUint =

6. Do Wkb Chap 6 (read pg 98 first.

W 9-12

Test 1 (First Hour) S&J Chap 7Work D8: 7-1 to 7-5 wkb Chap 6a Q11 = 6b

Hwk # 6 Chap 5 P 21,25,29,41.55, Chap 6 19, 17 B

M 9-17

Kinetic Energy & Power S&J Chap7 D9: 7-6 to 7-9 wkb chap 6 b&c Q13 = 8a

Hwk #7 Chap 7 2, ans F=31.7N, W = 1590J, 4, ans a)3.28 x10-2 J, b) - 3.28 x10-2 J, 9,11,13,15

W 9-19

Potential Energy S&J Chap 8 D10: 8-1 to 8-4 Q14 = 7b

Hwk #8 Chap 7 P24, ans 2 J, b) 5 m/s, c)6.3 J, 26, ans a&b) 60J, 31, 33, 35