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Viscous forces
Viscous force (or Drag force) is a force that acts on a body moving through a fluid (e.g. air or a liquid).
- Drag force increases with:
- relative speed of the object moving in the fluid
- cross-sectional area of the object perpendicular to the velocity
Air Resistance
- Air resistance is a common kind of drag force.
- e.g. air resistance acting on a feather falling through air.
- Air resistance increases with speed of moving body.
- Air resistance can be neglected for low speeds, e.g. a body falling through a small height.
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