Static friction is the force between two objects that are not moving
relative to each other.
Static Friction Formula :
Static Friction Coefficient:
μs = Static Friction Coefficient,
N = Normal Force.
Static Friction Example:
Case 1: A mass is resting on a flat surface which has a normal force of 98N, with a coefficient of
static friction of 0.35. What force would it take to move the object?
N = 98N, μs = 0.35
Step 1: Substitute the values in the below static friction formula:
This example will guide you to calculate the static friction manually.
Case 2: A 15kg piece of wood is placed on top of another piece of wood. There is 35N of static
friction measured between them. Determine the coefficient of static friction between the
two pieces of wood.
N = 15kg x 9.81 m/s2 = 147.15N, Fs = 35N
Step 1: Substitute the values in the below Static Friction Coefficient formula:
This example will guide you to calculate the Static Friction Coefficient manually.