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
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
Relations between Newton and dyne (SI Unit of force)
We know that,
1 N = 1kg-ms-2 = (1000g-100cm)s-2 = (105) (g-cm)s-2 = 105 dyne
⇒ 1N = 105 dyne
Other unit of force
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]