Enter the initial velocity, final velocity, time, and mass into the calculator to determine the deceleration force.

Deceleration Force Formula

The following equation is used to calculate the Deceleration Force.

DF = (Vi-Vf) / t * m

  • Where DF is the deceleration force (N)
  • Vi is the initial velocity (m/s)
  • Vf is the final velocity (m/s0
  • t is the change in time (s)
  • m is the mass of the object

To calculate the deceleration force, subtract the final velocity from the initial velocity, divide by time, then multiply by the mass.

What is a Deceleration Force?


A deceleration force is a force that opposes an object’s current direction of motion. A deceleration force acts to slow down the object, and it is the opposite of an acceleration force.

The acceleration of an object changes its velocity by altering both its speed and direction. Deceleration happens when the velocity is reduced in size or changed to a point in the opposite direction, but not when it stays constant.

How to Calculate Deceleration Force?

Example Problem:

The following example outlines the steps and information needed to calculate Deceleration Force.

First, determine the initial velocity. In this example problem, the initial velocity is measured to be 50 m/s.

Next, determine the final velocity. The final velocity of this object is 20m/s.

Next, determine the change in time. The change in time for this problem is 3 seconds.

Next, determine the mass of the object. The object’s mass is measured to be 5 kg.

Finally, calculate the deceleration force using the formula above:

DF = (Vi-Vf) / t * m

DF = (50-20) / 3 * 5

DF = 50 N