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The answer is: any force equal to or greater than the forward momentum of the truck. So many variables enter into calculating a precise measurement of force needed to stop a vehicle - mass of the vehicle, conditions of friction and gravity - is the truck going uphill or downhill, or on a flat surface? Is the road slippery, smooth or rough?

Let's assume that normal conditions apply: a truck weighing 10,000 Kg traveling at an acceleration rate of 5m/s² along a flat smooth surface. Using Newton's second Law of Motion, expressed as a formula F=ma, where F is the Net Force (the sum of all forces acting on an object) in Newtons, m is the mass of the truck, and a is its acceleration rate, assumed here to be 5m/s². By multiplying the mass times acceleration, we see that a whopping 50,000 Newtons would be required to stop this truck. By comparison, the pull of gravity on a person of average weight (72 Kg, or 160 lb) is measured at 686 Newtons. So depending on the type of truck, weather conditions, wind speed, direction of the truck, and effect of gravity and friction (all included in net force, or Newtons) you can see that the actual Force, expressed as N, is a variable.

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