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Velocity By Emily Terminal Velocity • When a sky diver leaves the aircraft he speeds up because there are unbalanced forces acting. His weight is greater than the fictional drag force. • As his speed increases, the fictional drag due to the air increases. • Spreading himself like a eagle increases the surface area and increases the fictional drag Velocity in a car • When cars first set off they have much more force accelerating them than resistance slowing them down. • As the speed increases the resistance builds up. This gradually reduces the acceleration until eventually the resistance force is equal to the drive force.