Enter the mass, initial velocity, final velocity, and change in time into the calculator to determine the average force.

## Average Force Formula

The following formula is used to calculate the average force of a moving object.

**F = m * (Vf – Vi) / t**

- Where F is the average force (N)
- m is the mass (kg)
- Vf is the final velocity (m/s)
- Vi is the initial velocity (m/s)
- t is the change in time

## Average Force Definition

Force is an interaction that causes a change in motion of an object. In other words, a force applied to an object causes that object to change in velocity. Note that this is a change in velocity, not just a change in position. Objects can change position when under a constant velocity but with no force.

The average force more specifically is the average amount of force that would have been applied to a certain object to increase it’s speed from an initial to final velocity over a given time. In reality the force may have been variable, but the result would be the same with the calculated average force.

## Average Force Example

How to calculate average force?

**First, determine the mass.**For this example the object is measured at 10kg.

**Next, determine the initial velocity.**In this example the object is at rest initially, so the velocity is 0m/s.

**Next, determine the final velocity.**The final velocity is 20m/s.

**Next, determine the change in time.**It took 5 seconds to increase the speed to 20m/s.

**Finally, calculate the average force.**The average force is calculated to be 10 * (20-0) / 5 = 40.

## FAQ

**What is average force?**

An average force is the average amount of force over a certain amount of time that is required to move an object from an initial velocity to a final velocity.