Question

from the table below, compare the coefficients for static and kinetic friction.
approximate coefficients of friction

	kinetic	static
rubber on concrete (wet)	0.58
rubber on asphalt (dry)	0.67	0.85
rubber on asphalt (wet)	0.53
rubber on ice	0.15	0.14
waxed ski on snow	0.05	0.14
wood on wood	0.30	0.42
steel on steel	0.57	0.74
copper on steel	0.36	0.53
teflon on teflon	0.04

the coefficient for static friction is always less than for kinetic friction
they are the same for all materials
the coefficient for static friction is always greater than for kinetic friction

Explanation:

Step1: Analyze the table values

For each material - pair in the table, compare the static and kinetic friction coefficients. For example, for rubber on concrete (dry), static is 0.90 and kinetic is 0.68; for rubber on asphalt (dry), static is 0.85 and kinetic is 0.67 etc.

Step2: Determine the general trend

In all cases shown in the table, the static - friction coefficient is greater than the kinetic - friction coefficient.

Answer:

The coefficient for static friction is always greater than for kinetic friction