The SI Unit of Force Is: The push or pull that changes the position of an object is called force. Force can also be defined as That

“external factor which causes or attempts to change the state of rest or motion of an object with uniform velocity”. That external factor is called force. It is represented by F. Force is a vector quantity. ,

**types of Force**

There are many types of forces, but all types of forces are divided into the following two categories.

(1) contact force

(2) non-contact force

**1. contact force**

The forces which act due to the contact of objects are called contact forces.

For example, pulling the bullock cart by the bullocks, friction force, viscous force etc. are examples of contact force.

**2. non-contact force**

Forces that are not in contact with objects, but act on the object through the medium of space. This type of force is called non-contact force.

Examples of non-contact forces are gravitational force, electromagnetic force, gravitational force, magnetic force, etc.

**force formula**

Newton’s second law of motion states that the force exerted on an object is proportional to the acceleration produced in it. i.e.

F a (if m is fixed)

F m (if a is fixed)

so keeping F ma

F = kma

k = 1

*F*=*m**a*

Force = mass × acceleration

This is the formula for force.

force formula

\footnotesize \boxed { \overrightarrow{F} = m\overrightarrow{a} }*F*=*m**a*

**unit of force**

From the formula of force,

F = ma

, so the SI unit of force is Newton. The unit of force in the MKS system is kilogram-meter/second ^{2} . Its unit in CGS system is gram-cm/sec ^{2} .

Dine is also another unit of force. Which is equal to ^{1} gram-cm/second .

**dimensional formula of force**

Its dimensional formula can be easily found from the formula of

force Force = mass × acceleration Force

on breaking down into smaller units

= kg × m/s ^{2}

Force = kg × m × sec ^{-2}

Hence the dimensional formula of force [ MLT ^{-2} ].

**relation between newton and dine**

1 Newton = 1 kg-m/s ^{2}

Now since 1 kg = 1000 g and 1 m = 100 cm. So

1 newton = 1000 g × 100 cm/sec ^{2}

1 newton = 10 ^{5} g-cm/sec ^{2}

Since we know that 1 dyne is equal to 1 gram-cm/sec ^{2 then}

\footnotesize \boxed { 1 newton = 10^5 dyne }1 new test _ _ _ _=105do not _ _

So there are 10 ^{5} dynes in 1 Newton, this is the relation between Newton and Diene.

**characteristics of force**

After applying a force on an object, the following types of changes can be observed in the object –

- The velocity of a moving object can increase or decrease.
- The shape and size of an object can both change.
- There may be a change in the direction of a moving object.

**force question answer**

**1. What is the SI unit of force?**

newton

**2. What will be the dimensional formula of force?**

The dimensional formula for force is [MLT ^{-2} ].

**3. What are the types of forces?**

There are two types of forces. Contact force and non-contact force.

**4. What is the unit of force?**

kg-meter/second ^{2}