Question

What is the net force?
A) Sum of all forces acting on a body
B) Multiplication of all forces acting on a body
C) Sum of all balanced forces acting on a body
D) Sum of all unbalanced forces acting on a body

Answer 1

Hint: Force accelerates the body at rest and it tends the object to come at rest when it accelerates. Hence, force is the product of mass and acceleration. The net force is the total amount of forces acting on a body.

Complete step by step answer:
(i) The total force acting on an object is called the net force. There are two types of forces called balanced and unbalanced forces. When the object is balanced on both of its sides is called balanced force. When the object is moved by an excess force which applied on one side, then it is called an unbalanced force.
(ii) These are not the only two forces acting on a body. Other forces are acting on a body when the body is at rest and in motion.
(iii) Hence we can neglect option C and option D.
(iv) Among the options A and B, we say addition is the net amount of anything. Hence, we choose option A. Therefore, the net force is the sum of all forces acting on a body. When the N number of forces acting on a body, the net force is equal to $F = {F_1} + {F_2} + ..... + {F_N}$

So, the correct answer is “Option A”.

Additional Information:
(i) When the body is at rest, there are some forces acting on it. If the body is at rest, the net force,
$F = {F_a} + {F_{grav}}$ where, ${F_a}$ is the force we applied to keep the object at rest and ${F_{grav}}$is the gravitational force.
(ii) If the body is in motion, there are another two forces acting on a body. The net force acting on a body is in motion is$F = {F_a} + {F_{grav}} + {F_f} + {F_N}$ where ${F_f}$ is the frictional force which resists the object from moving and ${F_N}$ is the normal force which is called as balance force.

Note:
There are many forces acting on a body if it is in motion or at rest. So we have to include all the forces to calculate the net force of the object. Hence the total amount of force on a body is called net force. This net force can be found by summing all the forces acting on a body.