Question

In SI unit of force, Newton (N) is given by (where m stands for metre and $s$ stands for second)
A.\[1N=1kg{{m}^{-1}}{{s}^{-2}}\]
B.$1N=1kgm{{s}^{-2}}$
C.$1N=1kg{{m}^{-1}}{{s}^{2}}$
D.$1N=1kgm{{s}^{2}}$

Answer 1

Hint: Force can be defined as an external push or pull capable of changing the state of rest of the motion of a particular body. Since it has both magnitude and direction it is a vector quantity. The SI unit of force is Newton.

Complete answer:
We know that
$F=ma$
Where F is force
M is mass and $a$ is acceleration respectively.
The unit of force is Newton and the unit of mass is kilogram and unit of acceleration is metre per Second Square respectively.
$\Rightarrow 1N=1Kgm{{s}^{-2}}$

Option B is the correct answer.

Additional Information:
There are different types of force like contact and non-contact force. Muscular force, Mechanical force and frictional force come under the category of contact force whereas gravitational force, the magnetic force comes under the category of non-contact forces.
Gravity is the weakest force and nuclear force is the strongest force.
Acceleration is defined as the rate of change of velocity with respect to time. It is a vector quantity since it has both magnitude and direction.
Uniform acceleration is the change of equal velocity in equal intervals of time. Non-uniform acceleration is the change of non-equal velocity in equal velocity in equal intervals of time.

Note:
There are other types of accelerations like angular acceleration which can be defined as the rate of change of angular displacement with time. Tangential acceleration which can be defined as the rate of change of tangential velocity with respect to time. Average acceleration is the rate of change of total velocity in a particular time interval.