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What Is The Normal Force

November 21, 2022 by Veerendra

What Is The Normal Force

The external agent which tends to set a body in motion or which changes the speed and direction of motion of a body or which can change the shape of a body is called force.
SI unit of force is Newton.

Types of Forces:

(a) Non Contact:
These are the forces in which contact between two objects is not necessary. Gravitational force between two bodies and electrostatic force between two charges are two examples of field forces.
(b) Contact Forces:
Two bodies in contact exert equal and opposite forces on each other. If the contact is frictionless the contact force is perpendicular to the common surface and known as normal reaction.
Contact-forces
If, however, the objects are in rough contact and move (or have a tendency to move) relative to each other without losing contact then frictional force arise which oppose such motion. Again each object exerts a frictional force on the other and the two forces are equal and opposite. This force is perpendicular to normal reaction. Thus, the contact force (F) between two objects is made up of two forces.
(i) Normal reaction (N) (ii) Force of friction (f)
and since these two forces are mutually perpendicular.
\(\text{F}=\sqrt{{{\text{N}}^{\text{2}}}\text{+ }{{\text{f}}^{\text{2}}}}\)

 

Filed Under: Physics Tagged With: Applications of frictional forces, Disadvantages of friction, Force, Fricton, Newton's First Law Of Motion, Reducing friction

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