How to Calculate Dynamic Force

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If an object has a mass (which all do) and acceleration (which it will have if it is moving), it has a dynamic force. Dynamic force is a measurement of the mass of an object multiplied by its rate of acceleration. So long as you know these two all-important pieces of information, you can calculate the dynamic force of your object in just a couple of seconds using little more than a calculator.

Things You'll Need

  • Scale
  • Stopwatch
  • Calculator
  • Measure the mass of your object (if you don't already have this information). Place your object on a regular scale and find its weight. Multiply its weight by 4.45 to convert from pounds to Newtons. Divide this number by 9.81 (the rate of gravity) to find its mass.

  • Find the velocity of your object and divide that by the time it took your object to reach its destination. For example, if your object is a rock and you're throwing that rock, throw your rock and start a stopwatch. Stop the stopwatch when the rock hits the ground. Measure the distance the rock has traveled and divide it by the time it took the rock to land. This is velocity.

  • Calculate the acceleration of your object by subtracting its final velocity from its initial velocity. If your object is a rock, its final velocity would be the number you calculated in Step 2. Its initial velocity would be 0 because it wasn't moving until you threw it. Subtract 0 from your Step 2 number. Divide that by the time you measured with your stopwatch in Step 2. This is acceleration.

  • Multiply the mass of your object (from Step 1) by the acceleration of your object (from Step 3). The number you get is the dynamic force of your object.

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