How can there be weight without movement?

Question

Weight is a force. Force is mass × acceleration. When I'm standing motionless on the scale, how do I have a weight greater than $0~\\mathrm{N}$ when my mass is $90~\\mathrm{kg}$ and my acceleration is $0$? $90~\\mathrm{kg}$ × $0~\\mathrm{m/s^2}$ = $0~\\mathrm{N}$\n\nEDIT: \nThanks, @Inquisitive for showing me that the acceleration component of force need not be explicit and allowing me to understand this concept of weight logically and mathematically.\n\nI weigh 200lbs. 9.8m/s^2 is 32.152ft/s^2. 200lbs ÷ 32.152 = 6.22slugs (about 90kg). 90kg × 9.8m/s^2 = 882N (about 200lbs)\n\nMy explicit acceleration of 0 is irrelevant to this equation. The magnitude of gravitational acceleration is the correct acceleration to use in this figure. The word "acceleration" caused the misconception that something would be visually observable, namely movement.

Answer 1

Weight is the result of the force of gravity. Gravity is a fundamental property of nature, in which there is a force between 2 objects proportional to the product of their masses. No motion is required.

It is common to express the effect of gravity in terms of acceleration. This is useful, e.g., in problems involving objects in "free-fall" (meaning that the only force acting on them is gravity).

Side note: Standing on the surface of the earth, you are in fact moving--in a circle. This requires a force to continually change your direction of motion. That force is supplied by gravity.