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Coefficient of Friction. Created for CVCA Physics By Dick Heckathorn 11 November 2K + 4. Table of Contents. 3 Coefficient of Friction Table 4 Force of ground on vehicle 5 μ of block sliding on table 7 μ of block sliding down ramp. Definitions.

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coefficient of friction

Coefficient of Friction

Created for CVCA Physics

By

Dick Heckathorn

11 November 2K + 4

table of contents
Table of Contents

3 Coefficient of Friction Table

4 Force of ground on vehicle

5μ of block sliding on table

7μ of block sliding down ramp

definitions
Definitions

Coefficient of friction (µ) is defined as the force of friction divided by the normal force.

FN

FN

Ff

Ff

Fe on block

Fe on block

slide4

Surface μ

Rubber on asphalt, dry 1.07

Rubber on asphalt, wet 0.95

Rubber on ice 0.005

Rubber on concrete, dry 1.02

Rubber on concrete, wet 0.97

Steel on steel – dry 0.41

Steel on steel – lubricated 0.12

Steel on ice 0.01

weight ford explorer 26 000 n

Force of Surface on Explorer

Weight Ford Explorer 26,000 N

dry - 1.07 wet - 0.95 ice - 0.005

Coefficient of friction

rubber on asphalt

Fapplied dry = 1.07 x 26,000N = 27,820 N

Fapplied wet = 0.95 x 26,000N = 24,700 N

Fapplied ice = .005 x 26,000N = 130 N

analysis block on table
Analysis – Block on Table

The Problem

What is the

coefficient of friction

of a block

sliding on a table?

analysis block on table7
Analysis – Block on Table

Force of Friction (Ff) =

Normal Force (FN) =

Find coefficient of friction (μ)

Force of earth on block =

Pull block at constant speed

FN = 12.48 N

F f = 4.5 N

F on B = 4.5 N

Fe on B = 12.48 N

finding coefficient of friction of block on ramp

Finding Coefficient of Friction of Block on Ramp

Created for CVCA Physics

By

Dick Heckathorn

6 December 2K+3

analysis block on ramp
Analysis – Block on Ramp

What is the

coefficient of friction

of a block

sliding on a ramp?

analysis block on ramp10
Analysis – Block on Ramp

Apparatus

- Meter sticks (2)

- Block with grove to fit over

meter stick

- scales to find weight of

block

analysis block on ramp11
Analysis – Block on Ramp

Procedure

Place block on meter stick.

Lift the meter stick until the block slides down the ramp at constant speed.

Determine the angle of the meter stick with horizontal.

Calculate the coefficient of friction.

block sliding at constant speed
Block sliding at constant speed

Finding the angle

Finding coefficient of fricton μ

The Measurements

Finding FN and Ff

FN = 1.134 N

θ

Ff = 0.449 N

36.8

cm

1 m

θ

Fe on B = 1.22 N

slide14
Portland Less than More than

Cement 30 mi/hr 30 mi/hr

Dry Road Surface

New, Sharp 0.8 - 1.2 0.7 – 1

Traveled 0.6 - 0.8 0.6 – 0.75

Traffic Polished 0.55 - 0.75 0.5 – 0.65

Wet Road Surface

New, Sharp 0.5 – 0.8 0.4 – 0.75

Traveled 0.45 - 0.7 0.45 – 0.65

Traffic Polished 0.45 - 0.65 0.45 – 0.6

slide15
Asphalt Less than More than

or Tar 30 mi/hr 30 mi/hr

Dry Road Surface

New, Sharp 0.8 - 1.2 0.65 – 1

Traveled 0.6 - 0.8 0.55 – 0.65

Traffic Polished 0.55 - 0.75 0.45 – 0.65

Excess Tar 0.5 – 0.6 0.35 – 0.6

Wet Road Surface

New, Sharp 0.5 – 0.8 0.45 – 0.75

Traveled 0.45 - 0.7 0.4 – 0.65

Traffic Polished 0.45 - 0.65 0.4 – 0.6

Excess Tar 0.3 – 0.6 0.25-0.55

slide16
Less than More than

Gravel 30 mi/hr 30 mi/hr

Dry Road Surface

Pack, Oiled 0.55 – 0.85 0.5 – 0.8

Loose 0.4 - 0.7 0.4 – 0.7

Wet Road Surface

Pack, Oiled 0.4 – 0.8 0.4 – 0.6

Loose 0.45 - 0.75 0.45 – 0.75

slide17
Less than More than

Gravel 30 mi/hr 30 mi/hr

Dry Road Surface

Ice Smooth 0.1 – 0.25 0.07 – 0.2

Snow Packed 0.3 - 0.55 0.35 – 0.55

Snow Loose 0.1 – 0.25 0.1 – 0.2

Wet Road Surface

Ice Smooth 0.5 – 0.1 0.05 – 0.1

Snow Packed 0.3 - 0.6 0.3 – 0.6

Snow Loose 0.3 - 0.6 0.3 – 0.6