A ripe apple weighs about 1 N, so this force is comparable to a few apples.
The newton is the SI unit of force: one newton accelerates one kilogram at one metre per second squared (F = ma).
Gravitational units (lbf, kgf) depend on standard gravity (9.80665 m/s²); the newton does not, so it is preferred for unambiguous engineering calculations.
The poundal is the foot-pound-second unit of force (1 pdl accelerates 1 lb at 1 ft/s²), while a kip is simply 1,000 pound-force, used in US structural engineering.
Next stepSwitch to F = ma mode to compute force from a mass and acceleration instead.