What is Force?
Newton's Second Law states that Force equals mass times acceleration (F = ma). It's the foundation of classical mechanics and explains how objects move when forces act on them.
Weight is a special case of force where acceleration = g (gravity, 9.8 m/s² on Earth).
Formula
F = m × a m = F / a a = F / m
Weight = mass × g - Earth: g = 9.8 m/s² - Moon: g = 1.62 m/s² - Mars: g = 3.72 m/s²
1 Newton = force to accelerate 1 kg by 1 m/s²
How to use this Force Calculator?
1. Enter mass in kg. 2. Enter acceleration in m/s² (9.8 for gravity). 3. See force in Newtons and weight comparisons.