Spread the love

SI Unit of force | Unit of force | CGS unit of force

SI Unit of force

SI unit of force is Newton, which is defined as….

1 Newton is that force which produces an acceleration of 1 ms^-2 in an object of mass 1 kg.

From newton’s second law i.e., F = ma, when m = 1kg and a = 1 ms^-2, then

F = 1kg × 1 ms^-2 = 1kgms^-2 = 1N

CGS unit of force is dyne

1dyne :- 1 dyne is that force which produces an acceleration of 1 cms^-2 in an object of mass 1 g.

Again from newton’s second law i.e., F = ma, when m = 1g and a = 1 cms^-2, then

F = 1g × 1 cms^-2 = 1gcms^-2 = 1dyne

We know that,

1 N = 1kg-ms^-2= (1000g-100cm)s^-2= (10⁵) (g-cm)s^-2= 10⁵dyne

⇒ 1N = 10⁵dyne

Kilogram force ( kgf ) : – The force with which the earth attracts an object of one kilogram mass towards its center is called one kilogram force.

1 kgf = Weight of object of mass 1 kg = mg = 1kg × 9.8ms²= 9.8 kg-m/s²= 9.8 N

1 kg of force ≈ 10 newtons

Dimensional formula of force : – [ M L T^-2]