1. Work, Power, Weight, and Kinetic energy are all scalar quantaties. Which cannot be less than zero? 2. Relevant definitions Work is a force action through a distance that is in the direction of the force. Power is the rate at which work is performed. Weight is the force exerted on a mass as a force of gravity. Kinetic energy is the energy (ability to do work) a body or particle posseses because of its motion. 3. The attempt at a solution Could only find the definitions to assist me. Work can be consumed, so can power, so I'm pretty sure those are not the answer. Then, when there is no movement of particles, there would be no kinetic energy, right? But can there be less than that? Moving backwards? What about weight. It is possible to have an absence of a gravitational force, but can there be less than that? There should only be one answer. I am leaning towards weight, but if someone can clarify for me, and tell me if I'm right, totally wrong, etc, I'd appreciate it.