The newton

The newton, (N), is the standard scientific unit of force. It is defined as the force that, when applied to a mass of 1.0 kg, produces an acceleration of 1.0 m/s².

This definition is consistent with the equation F = ma, since it says that:

1.0 N = 1.0 kg x 1.0 m/s², or 1.0 x 1.0 = 1.0

One newton is just about equal to the weight of one eating apple.