Let us imagine a car at rest. To start it without making use of the accelerator, one will have to use a lot of force.
This is static friction! Here the object at rest is made to move to conflict the frictional force.
Static friction is the resistive force perceived in a body which is at rest. It is articulated as
static friction is Fs ,
the coefficient of static friction is μs
the normal force is Fn
Static Friction Formula helps one to compute the frictional force, co-efficient of friction or normal force in any asked numerical.
Static Friction Solved Examples
Underneath are numerical on static friction which helps to comprehend where one can use this formula:
Problem 1: A force of 200 N is exerted on a snacks box of 5kg still on the floor. If the coefficient of friction is 0.3, Calculate the static friction.
Fn (Normal force) = 200 N,
μs (Coefficient of friction) = 0.3,
Static friction is given by Fs =μs Fn
= 0.3 × 200 N
Fs = 60 N.
Problem 2: Amy is hauling a toy car of mass 4 kg which was at rest earlier on the floor. If 50 N is the value of the static frictional force, calculate the friction coefficient?
m (Mass) = 4 kg,
Fs (static frictional force) = 50 N,
Fn (Normal force) = mg
= 4 Kg × 9.8 m/s2
Fn= 39 N
μs = Fs /Fn
μs = 50/39
μs = 1.282