## Impulse

Impulse is given by,

$$\vec{I} = \vec{F_a} t$$

Where $$\vec{F_a}$$ is the average force acts on the particles and t is the time for which the force acts on the particle.

## Force

Force on a particle having mass m is given by,

$$\vec{F} = m\vec{a}$$

Where, $$\vec{a}$$ is the acceleration of the particle.

• SI unit of force is Newton ( N ), which is equal to kilogram metre per second ( kg m s-1 ).
CGS unit of force is dyne.

## Learn some extra:

### What is the value of 1N in terms of fundamental units?

As we know that,
F = ma
So, 1N = 1 kg × 1m s-2
Or, 1N = 1 kg m s-2
So, the value of 1N in terms of fundamental units is 1 kg m s-2.

### What is the value of 1dyne in terms of cgs units?

As we know that,
F = ma
So, 1dyne = 1 g × 1cm s-2
Or, 1dyne = 1 g cm s-2
So, the value of 1dyne in terms of cgs units is 1 g cm s-2.

### What is the relation between newton and dyne?

As we know that,
F = ma
So, 1N = 1 kg × 1m s-2
Or, 1N = 103g × 102cm s-2
Or, 1N = 105 g cm s-2
Or, 1N = 105 dyne
So, the 1N is equal to 105 dyne.

## Linear momentum

Linear momentum of a moving particle is given by,

$$\vec{p} = m\vec{v}$$

Where m is the mass of moving particle with velocity $$\vec{v}$$

## Galileo’s law of inertia

A body continues in its state of rest or constant velocity along the same straight line, unless not disturbed by some external force. This is Galileo’s law of inertia.