Home / Formulas / Physics Formulas
Normal Force
The normal force is equal to the weight of the body during deceleration. When the body is about fall, depends on the location of the body on the ground. The normal force is represented by FN and measured in terms of N (Newtons)
An object during rest on the flat surface the normal force FN is
FN = mg
Where,
g = Gravitational Force
m = mass is m
A force acting on a falling object it drops at an angle of θ, then the FN is grater than the formulated weight,
FN = mg + F sin θ
Where,
the normal force is FN
the mass of the body is m
gravitational force is g
the angle with which body falls is θ
A force tugs the object towards upward, then FN is less than its weight
FN = mg – F sin θ
Where,
the normal force is FN
the mass of the body is m
gravitational force is g
the angle with which body moves up is θ
An object placed on an inclined plane then normal force FN is
FN = mg cos θ
Where,
the normal force is FN
the mass of the body is m
gravitational force is g
The angle of the inclined surface is θ
Solved Example
Example 1: A text-book of mass 1.7 kg is kept on the table. Calculate the normal force being applied on the book.
Solution:
Given:
m = 1.7 kg
w.k.t g (gravitational force) = 9.8 ms-2
The normal force is
FN = mg
FN = 1.7 × 9.8
FN = 16.66 N
Thus, the normal force being applied on the textbook is 16.66 N.