DATA TABLE 1: Mass of block: 0.044Kg Weight: 3.68N
|
Flat Board
|
Force of Kinetic Friction, N
|
Force of Static Friction, N
|
|
Trial 1
|
0 .40
|
1.00
|
|
Trial 2
|
0.35
|
0.90
|
|
Trial 3
|
0.35
|
0.90
|
|
Average
|
0.37
|
0.93
|
DATA TABLE 2: Mass of block:0.044 Kg Weight: 3.68N
|
Flat Board - Block Sideways
|
Force of Kinetic Friction, N
|
Force of Static Friction, N
|
|
Trial 1
|
0.50
|
0.80
|
|
Trial 2
|
0.45
|
0.85
|
|
Trial 3
|
0.40
|
0.85
|
|
Average
|
0.45
|
0.83
|
DATA TABLE 3:
|
Surfaces Tried:
Glass Surface
|
Force of Kinetic Friction
|
Force of Static Friction
|
|
Trial 1
|
0.35
|
0.60
|
|
Trial 2
|
0.40
|
0.55
|
|
Trial 3
|
0.40
|
0.40
|
|
Average
|
0.38
|
0.52
|
DATA TABLE 3a:
|
Surfaces Tried:
Sandpaper
|
Force of Kinetic Friction
|
Force of Static Friction
|
|
Trial 1
|
0.70
|
0.60
|
|
Trial 2
|
0.65
|
0.70
|
|
Trial 3
|
0.60
|
0.70
|
|
Average
|
0.65
|
0.67
|
DATA TABLE 3b:
|
Surfaces Tried:
Wood on Carpet
|
Force of Kinetic Friction
|
Force of Static Friction
|
|
Trial 1
|
2.40
|
2.70
|
|
Trial 2
|
2.50
|
2.65
|
|
Trial 3
|
2.30
|
2.60
|
|
Average
|
2.40
|
2.65
|
DATA TABLE 4:
|
|
Height
|
Base Length
|
θ max
|
μs
|
|
Trial 1
|
12.80 cm
|
34.00 cm
|
21
|
|
|
Trial 2
|
12.90 cm
|
34.00 cm
|
20
|
|
|
Trial 3
|
13.00 cm
|
34.00 cm
|
22
|
|
|
Average
|
12.90 cm
|
34.00 cm
|
21
|
|
Questions:
A. How does the coefficient of static friction compare with the coefficient of kinetic friction for the same surfaces and areas?
B. Why is it important to reduce friction during the operation of machinery?
C. How does grease or oil affect the coefficient of friction?