Energy {kinetic energy}| can involve motion. Kinetic energy equals one-half times mass m times velocity v squared: KE = 0.5 * m * v^2. If object does work and loses speed, object loses kinetic energy. If object receives work and increases speed, object gains kinetic energy.
force
Collision, pushing, pulling, or other contact force F acting over distance ds makes mass m accelerate a to velocity v: dKE = F * ds = m * a * ds = m * (dv / dt) * ds = m * dv * ds / dt = m * v * dv, where t is time. Integral of dv = v/2, so KE = 0.5 * m * v^2.
comparison
Energy is either kinetic expressed energy or potential stored energy, because force times distance makes kinetic energy, and kinetic energy can act against force over distance to make potential energy.
Physical Sciences>Physics>Dynamics>Energy
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Date Modified: 2022.0224