rate, until eventually reaching a steady-state velocity as the drag force comes into equilibrium with the force from gravity. This is the concept of viscous drag, which for example is applied in automatic doors or anti-slam doors. Damping in Electrical Systems / Resistance Electrical systems that operate with alternating current (AC) use resistors to damp the electrical current, since they are periodic. Dimmer switches or volume knobs are examples of damping in an electrical system. Magnetic Damping Kinetic energy that causes oscillations is dissipated as heat by electric eddy currents which are induced by passing through a magnet's poles, either by a coil or aluminum plate. In other words, the resistance caused by magnetic forces slows a system down. An example of this concept being applied is the brakes on roller coasters. References 11. Britannica, Encyclopædia. “Damping.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., www.britannica.com/science/damping. 12. OpenStax, College. “Physics.” Lumen, courses.lumenlearning.com/physics/chapter/23-4-eddy-currents-and-magnetic-damping/. Dimensionless numbers of mechanics Engineering ratios Ordinary differential equations Mathematical analysis Classical mechanics