1. +0.4 +0.4 x: log(ab) = log a + log b log 12 = log 3 + log 4 3 3 3
10
10x: 2 3 4 5 6 7 8 9 17 20 11 30 12 40 13 60 80 12
100 = 1
100.4 = 2.51
101 = 10
101.4 = = 25.1
102 = 100
How to plot 17?
Plot 16 (= 4  4) and 18 (= 3  6)

2. How to read a point on a log scale?
40 mm
76 mm

3. 1 1 How to locate the fulcrum of a lever on a log scale?
Fulcrum is at the midpoint.

4. 10 1 How to locate the fulcrum of a lever on a log scale? (part 2)
length of left arm = x
total length of lever = = 99
total mass = = 11
9 + 1 = 10
Check: 9  10 = 90  1 ?
Yes!